Wettbewerb im Verkauf. Modellanalyse des Anbieterverhaltens

[Title Page and Publication Information]: Title page and publication details for the German translation of Fritz Machlup's 'The Economics of Sellers' Competition'. It identifies the translator as Hans-Wolfram Gerhard and provides the original 1956 publication context. [Preface to the English Edition]: Machlup introduces his methodological approach, defining 'model analysis' as the use of constructed human behavior models to solve economic problems. He explains his decision to limit mathematical and geometric tools to maintain accessibility for non-mathematicians. The preface also contextualizes this work within his broader research on competition and monopoly, acknowledging the influence of thinkers like Joan Robinson, Edward Chamberlin, and Alfred Schütz. [Preface to the German Edition]: In this 1965 preface, Machlup emphasizes 'methodological subjectivism' as the core principle of the book. He argues that economic explanations must go beyond objective observations to understand the subjective expectations and motives (invisible building blocks) behind actions. He defends this approach against charges of tautology, explaining that theory aims to explain price changes by combining behavioral assumptions with verifiable factual changes. [Table of Contents]: A comprehensive table of contents outlining the seven parts of the book: theory of the firm, polypoly, market entry (pleiopoly), the interaction of polypoly and pleiopoly, oligopoly, oligopoly under pressure of new competition, and monopoly. It includes detailed sub-sections on non-price competition, collusion, and the 'tangent rule'. [Part One: Theory of the Firm and Types of Competition]: Opening header for the first major division of the book, which focuses on the foundational theory of the enterprise and the classification of various competitive market structures. [Chapter 1: Model Analysis and Observation: Prices and Costs]: This introductory section of Chapter 1 discusses the fundamental role of model analysis in economics. Machlup argues that all economic thinking involves abstraction and the construction of mental models to understand causal relationships. He defends the use of 'unrealistic' models in price theory, explaining that their value lies in their ability to isolate relevant factors and produce results that correspond to observed reality, rather than in their descriptive accuracy. [Theoretical vs. Descriptive Economics and Levels of Analysis]: Machlup explores the distinction between theoretical and descriptive economics, suggesting that even descriptive work relies on underlying theoretical models. He defines three levels of analysis in price theory: the firm, the industry (branch), and the total economy. He introduces the concept of equilibrium as a heuristic fiction used to explain movement and adjustments to changes in economic forces. [The Choice of Models: Economy, Industry, and Firm]: This segment discusses how economists choose between models of the firm, industry, or total economy based on the specific problem at hand, such as analyzing cartels, import quotas, or wage hikes. Machlup addresses the 'unrealistic' assumption of homogeneity in goods and production factors, arguing that it is a necessary simplification for theoretical clarity. He also examines how differences in factor prices (like labor or land) can be interpreted either as natural consequences of location or as results of monopolistic restrictions. [Entrepreneurial Profit and the Lack of Empirical Data]: Machlup discusses the difficulty of distinguishing between 'pure' entrepreneurial profit, luck, and monopoly profit in empirical data. He highlights the severe lack of usable price and cost data, noting that 'price' is difficult to define due to variations in quality, location, and delivery terms. He also addresses the problem of 'dating' data—aligning the timing of orders, production, deliveries, and payments for accurate comparison. [Production Costs and Accounting Challenges]: This section details the complexities of calculating total production costs. Machlup distinguishes between historical, legal, and economic perspectives on costs, particularly regarding fixed assets, depreciation, and interest. He argues that accounting data (book values) rarely provide the correct basis for economic analysis of competitive resource use and discusses how different inventory valuation methods (like LIFO) can significantly alter reported profits. [Average Costs and Joint Production]: Machlup examines the concept of average or unit costs, emphasizing that their calculation is often arbitrary due to the problem of allocating fixed and overhead costs, especially in multi-product firms or joint production (Kuppelproduktion). He concludes that there are no 'actual' objective unit costs, only subjective values derived from chosen accounting formulas and conventions. [Marginal Costs and Hypothetical Functions]: In contrast to average costs, Machlup argues that marginal costs can be determined more clearly because they ignore irrelevant fixed costs and focus on the change in total costs resulting from a small change in output. He explains how to calculate marginal costs even for joint products. Finally, he introduces the necessity of 'hypothetical' price and cost functions (curves) in economic theory, which represent 'ex ante' expectations rather than past 'facts,' as they explain why certain prices and quantities are chosen over others. [Chapter 2: The Theory of the Firm - Marginal Analysis of Prices and Quantities]: Machlup introduces the theory of the firm as a subset of price theory, emphasizing that models are constructed for specific purposes and are not universally applicable. He defines the 'relativity of model relevance' and distinguishes between positive causal analysis and normative welfare analysis. The section argues that while the traditional theory of the firm is useful for price and output decisions, it is less relevant for theories of firm growth or investment. [Behavioral Models and Model Simplification]: This segment details the construction of firm behavior models, outlining eight specific simplifications used to make complex economic realities manageable. These include reducing factor supply and product demand to simple price-quantity relationships, assuming profit maximization, and consolidating functions into a single cost function. Machlup defends these abstractions as necessary for analytical clarity, provided their limitations are understood. [Marginalist Thinking and the Logic of Maxima]: Machlup explains marginal analysis as a logical process for determining maxima based on the 'economic principle.' He clarifies that the theory does not require firms to be perfectly rational or solely focused on money profits in reality; rather, it assumes that the rational-economic portion of behavior is influential enough to justify the model. The core logic of equating marginal cost and marginal revenue is presented as a natural extension of rational decision-making. [The Determination of Prices and Output]: The author discusses the limits of equilibrium theory, noting it does not explain every historical factor behind a firm's current state but rather focuses on how firms react to changes in conditions. Economic theory is defined as a theory of adjustment to change, using equilibrium and marginal calculus as its primary instruments. He references Hall and Hitch regarding the historical elements in pricing. [Subjectivity of Costs and Revenues]: Machlup emphasizes that the values used in marginal analysis (costs, revenues, profits) are subjective estimates existing in the mind of the entrepreneur. He argues that 'objective' costs calculated by outsiders are irrelevant to the entrepreneur's actual decision-making process. The segment addresses critics like R.A. Gordon, clarifying that while initial positions may be subjective, the direction of adjustment to objective changes (like a tax or price increase) remains predictable. [Variables, Time Horizons, and the Logic of Calculation]: This section addresses the practical application of marginalism. Machlup discusses why variables like quality and advertising are often omitted for simplicity and how the theory handles multi-product firms. He clarifies that the 'short run' and 'long run' are defined by the entrepreneur's subjective time horizon for expected demand. Finally, he uses an analogy of a driver overtaking a truck to explain that entrepreneurs often act on 'marginal' logic through routine and intuition without needing explicit numerical calculations. [The Seven Steps of Marginal Productivity Calculation]: A detailed seven-step breakdown of how to calculate the net marginal product of a production factor, accounting for physical output increases, price changes, revenue losses from price reductions, and complementary expenses. [The Overtaking Analogy and Routine Decision-Making]: Machlup uses the analogy of a driver overtaking a truck to explain that economic actors make complex decisions based on multiple variables through routine and 'feeling' rather than explicit mathematical calculation. He defends economic theory against critics like Richard Lester who claim marginal analysis is unrealistic because businessmen do not perform formal calculations. [Subjectivity and Marginal Analysis of Changes]: Explains that entrepreneurs rely on intuition ('Fingerspitzengefühl') rather than exact accounting to align marginal costs and revenues. The section emphasizes that the theory's value lies in predicting the direction of change in response to variables, rather than providing exact quantitative descriptions of a single firm's state. [Non-Pecuniary Considerations in Firm Theory]: Discusses how non-monetary motives (prestige, leisure, social obligations) can be integrated into marginal analysis. Machlup warns against making the theory tautological by defining every action as profit-maximizing, suggesting instead that non-pecuniary factors often act as constants that do not alter the direction of reaction to typical economic changes. [Managerial Interests and External Constraints]: Examines deviations from profit maximization due to external factors like wartime patriotism, legal constraints, and the diverging interests of managers versus owners. Cites George Katona to argue that despite the separation of ownership and control, the profit motive remains central to firm behavior. [Profit Maximization under Uncertainty and Security]: Critiques the attempt to separate the 'security motive' from 'profit maximization'. Machlup argues that risk and security are inherently part of the profit calculation (using the 'bird in the hand' proverb) and that a single maximization postulate is sufficient for ideal-typical models. [The Validity of Marginalism in Uncertain Environments]: Responds to radical critics like Alchian and Tintner who argue uncertainty makes profit maximization meaningless. Machlup contends that even if entrepreneurs choose optimal probability distributions rather than single values, the theory remains a valid tool for explaining how data changes (like new taxes) shift equilibrium positions. [Chapter 3: The Practice of the Firm - Empirical Evidence and Counter-Evidence]: This introductory section of Chapter 3 addresses the perceived conflict between economic theory and business practice. Machlup argues that doubts regarding the validity of the theory of the firm often stem from a naive acceptance of businessmen's retrospective justifications and semantic misunderstandings rather than systematic empirical evidence. [The Vocabulary of the Economist and Business Language]: Machlup explains that the absence of technical economic terms (like marginal cost or elasticity) in a businessman's vocabulary does not prove that they do not think in those terms. He argues that scientific descriptions of behavior often use language foreign to the actor, and that complex economic concepts can be translated into everyday business questions to reveal underlying marginalist logic. [Retrospective Justification of Decisions and Actions]: This section discusses the psychological tendency of subjects to provide rationalized, 'fair', or socially acceptable motives for their past actions rather than true explanations. Machlup critiques the use of written questionnaires in business research, advocating instead for deep personal interviews and the analysis of specific decisions to separate decorative justifications from actual behavioral drivers. [Averages of Fluctuating Costs and Prices]: Machlup distinguishes between averages over time and averages as a function of output. He demonstrates that calculating average prices or costs to account for cyclical or seasonal fluctuations is entirely consistent with marginalist principles, as these averages are necessary components for estimating marginal changes in revenue and cost. [Actual and Potential Average Costs]: The author illustrates how a businessman's use of average cost figures can actually mask a marginalist calculation. By comparing four ways of expressing the same decision-making logic, Machlup shows that considering potential average costs at different output levels is mathematically equivalent to a marginal analysis of profit changes. [Average Cost Pricing as a Legal and Accounting Ideal]: Machlup explores why businessmen often cite average costs as their pricing basis: it aligns with legal standards of 'fairness' and accounting ideals of 'solidity'. He argues that while accountants often misunderstand the marginal principle as a threat to covering fixed costs, the marginalist approach actually aims for profit maximization, which naturally includes covering all costs when possible. [Average Cost Pricing as an Instrument of Cartel Policy]: This section analyzes how the 'full cost' or average cost rule serves as a tool for tacit or explicit collusion. By adhering to a shared cost-plus formula, firms effectively reduce the perceived elasticity of demand and prevent competitive price cutting, which Machlup interprets as a strategic decision consistent with long-term profit considerations within a cartel framework. [Average Costs as a Proxy for Long-term Demand Elasticity]: Machlup argues that businessmen use their own average costs to estimate the costs of potential competitors. Maintaining prices near average costs is often a rational response to high long-term demand elasticity caused by the threat of new entrants or competitor expansion, rather than a sentimental attachment to the cost-plus formula. [Empirical Research on Pricing Methods in Practice]: Machlup critiques the famous study by Hall and Hitch, which claimed to debunk marginalism. He re-interprets their findings, showing that the reported variations in profit margins and the fear of competitor reactions actually support the marginalist view that firms are sensitive to demand elasticity and profit opportunities, despite their use of 'full cost' terminology. [The Absence of Numerical Estimates and the Role of Theory]: Machlup addresses the objection that businessmen do not possess exact numerical data for marginal costs or revenue. He argues that the lack of precise figures does not make the concepts irrelevant; economic theory is an analytical schema for describing processes, not a literal description of the conscious calculations performed by actors in daily life. [Confronting Conflicting Claims: Full Cost vs. Marginalism]: Machlup reconciles the 'full cost' and 'marginalist' theories by assigning them different roles: full cost describes routine behavior in stable times, while marginalism explains strategic adjustments during periods of change. He cites the existence of anti-price-cutting laws and price ceilings as indirect proof that firms are constantly tempted to deviate from average cost pricing to maximize profits. [Monopoly Power and Break-Even Charts]: The author argues that only firms with significant monopoly power can afford to ignore profit maximization in favor of rigid cost-plus rules. He also dismisses the use of 'break-even charts' as evidence against marginalism, characterizing them as simple arithmetic aids for sales staff rather than comprehensive pricing strategies. [Theory and Practice: Final Reflections]: Machlup concludes the chapter by reflecting on the perennial tension between theory and practice. He defends the theory of the firm against charges of being 'unrealistic', suggesting that such criticism often arises from a misunderstanding of what a general theory is intended to achieve and explain. [Kapitel 4: Typen des Wettbewerbs im Verkauf - Einleitung und Begriffsbestimmung]: Machlup introduces the multi-faceted nature of 'competition' (Konkurrenz), arguing that a single definition is insufficient due to the term's varied meanings in economic theory and practice. He outlines the structure of Chapter 4, which will categorize competition into types such as polypoly, oligopoly, pleiopoly, and monopoly, while noting how economic changes constantly evolve these definitions. [Differenzierung der Konkurrenzbegriffe und Adjektive]: The author examines the various effects attributed to competition, such as eliminating excess profits or forcing marginal cost pricing, and argues these effects stem from different phenomena. He lists numerous adjectives used by businessmen (e.g., ruinous, fair) and economists (e.g., atomistic, perfect, workable) to qualify competition, emphasizing that students must understand the underlying logic rather than memorizing definitions. [Konkurrierende Güter vs. Konkurrierende Anbieter]: Machlup distinguishes between competition between goods (substitutability) and competition between suppliers (rivalry). He explains that even if a single supplier exists, their goods still compete for consumer purchasing power against all other goods, but this 'impersonal' competition is distinct from the conscious rivalry between multiple sellers in a market. [Methoden der Umsatzerzielung und Käuferwahl]: This section classifies competitive actions into positive (improving one's own offer via price, quality, or service) and negative (hindering competitors, often termed 'unfair competition'). It also discusses the consumer's perspective, noting that having multiple sources of supply is a key element of consumer sovereignty, even if it doesn't always lead to lower prices. [Das Polypol: Definition und Typologie]: Machlup defines polypoly as a market state where an individual seller feels like 'one among many' and does not expect competitors to react to their actions. He distinguishes between the polypolist who cannot determine their own price (pure competition) and the polypolist with differentiated products who has some price discretion but limited sales volume. [Reine Konkurrenz und die horizontale Preis-Absatzkurve]: Focusing on 'pure competition', Machlup explains why the individual seller perceives a perfectly elastic (horizontal) demand curve. This occurs when there are many small sellers and the product is undifferentiated. He emphasizes that this is a subjective perception of the seller, which differs from the actual market demand curve estimated by researchers. [Das differenzierte Polypol (Monopolistische Konkurrenz)]: Machlup discusses polypoly with differentiated products, often called 'monopolistic competition'. Here, the seller has some price-setting power due to customer loyalty or product differences, resulting in a downward-sloping demand curve. However, because the number of sellers is large, the individual still does not fear specific retaliatory reactions from rivals, distinguishing it from oligopoly. [Logik und Vorbedingungen des Pleiopols]: The author details the differences between polypoly and pleiopoly across five logical dimensions (subjectivity, target group, time horizon, equilibrium type, and verification). He then lists the necessary conditions for pleiopoly to exist, such as knowledge of profits, availability of specialized factors, lack of state intervention, and absence of predatory threats from incumbents. [Das Monopol: Der alleinige Anbieter]: Monopoly is defined by the absence of polypoly, oligopoly, and pleiopoly. A true monopolist is a seller who faces no direct rivals and no threat of entry. Machlup notes that 'monopoly' depends on how broadly one defines an industry; a monopolist competes for general consumer purchasing power but does not recognize specific goods or sellers as direct competitors. [Der vollkommene Markt: Definitionen und Kriterien]: Machlup separates the concept of 'market perfection' from 'perfect competition'. He proposes five possible definitions (A-E) for a perfect market, ranging from price uniformity and flexibility to institutional conditions like transparency, accessibility, and lack of restrictions. He settles on Definition C (institutional conditions) as the most useful for distinguishing market functioning from the market position of individual firms. [Zusammenfassung der Verkaufskonkurrenz-Typen]: The author summarizes the various types of competition discussed: substitutability between goods, positive/negative behavior, choice of sources, polypoly (pure and differentiated), oligopoly, pleiopoly, monopoly, and market perfection. He notes that different classifications are useful depending on the specific analytical problem at hand. [Exkurs: Typen des Wettbewerbs im Einkauf (Monopson, Polypson, Oligopson)]: This appendix mirrors the sales competition types for the purchasing side (buying/hiring). It defines Polypson (many buyers), Oligopson (few buyers aware of each other), and Monopson (single buyer). Machlup highlights that a firm can hold different market positions simultaneously across various input markets (e.g., labor vs. raw materials) and output markets. [Kapitel 5: Das vollkommene und das unvollkommene Polypol]: This introductory section of Chapter 5 defines polypoly as a market position where a seller does not consider competitors' reactions, typically due to a small market share among many sellers. Machlup argues that the distinction between polypoly, oligopoly, and monopoly is analytical rather than decorative, providing explanatory value for production volumes and prices. He emphasizes that the defining characteristic is the seller's mindset (lack of rivalry consciousness) rather than just the numerical count of participants, and introduces the 'method of imaginary introspection' to understand economic behavior. [Das vollkommene Polypol: Ausbringungsmenge und Unternehmungsgröße]: Machlup analyzes the behavior of a seller in a perfect (undifferentiated) polypoly, where the seller accepts a given market price and adjusts output until marginal cost equals price (GK = P). He discusses the subjective nature of price expectations and the role of time in production adjustments. The section also explores the relationship between output and firm size, noting that while perfect polypoly doesn't logically exclude 'too large' firms, it typically implies firms are small relative to the total market, especially where optimal size is small compared to industry demand. [Das unvollkommene Polypol: Produktdifferenzierung und Kapazität]: This section examines imperfect (differentiated) polypoly, where sellers face downward-sloping demand curves due to product differences but still lack rivalry consciousness. Machlup explains that for these sellers, marginal revenue is less than price (GE < P), leading to an equilibrium where marginal cost equals marginal revenue but is lower than the selling price. He critiques the simple assumption that differentiation always restricts output compared to pure competition, suggesting that differentiation can expand total market demand or lead to external economies. He also discusses how imperfect polypoly can lead to firms remaining below optimal size or maintaining excess capacity. [Transportkosten und Marktstellung]: Machlup analyzes how transport costs create spatial differentiation, turning potentially perfect polypolies into imperfect ones or even regional oligopolies. He explains that centralized markets can eliminate spatial differentiation but may increase total costs due to 'cross-hauls' and transport detours. The section concludes by relating transport costs to optimal plant size: polypoly is most likely when plant sizes are small, transport costs are low, or producers/consumers are highly concentrated. High transport costs relative to value tend to fragment markets, potentially creating oligopolistic conditions in local regions despite many sellers nationally. [Exkurs: Grenzerlös und Preiselastizität der Nachfrage]: A mathematical and geometric appendix deriving the relationship between marginal revenue (GE), price (P), and the price elasticity of demand (e). It provides the formula GE = P(1 - 1/e) and defines the 'price-sacrifice to sales-increase ratio' (f) as the reciprocal of elasticity. The section includes a placeholder for a geometric diagram (Fig. 1) illustrating these concepts. [Kapitel 6: Der polypolistische Nicht-Preiswettbewerb und andere Formen des unvollkommenen Polypols]: This chapter introduction and initial sections explore non-price competition within polypolistic market structures. Machlup examines how institutional factors, such as price maintenance or tradition, shift competition from price to quality and sales efforts. He discusses the 'reaction-consciousness' that arises when institutional sanctions are possible, blurring the line between polypoly and oligopoly. The text also analyzes the relationship between product standardization and the ease of price-fixing, noting that differentiation can sometimes be a more effective competitive tool when price competition is restricted. [Der polypolistische Qualitätswettbewerb: Meßbarkeit und Determinierung]: Machlup investigates the theoretical determination of product quality. He addresses the difficulty of measuring 'quality' compared to physical quantity, suggesting the use of 'hedonistic quality indexes' or ordinal scales. Through three-dimensional modeling (price, quantity, quality), he demonstrates that an optimal quality is reached at the 'maximum maximorum'—the highest of all possible profit maxima across different quality levels. He also notes the complexities introduced by joint production and sales interdependencies in multi-product firms. [Der Einfluß der Absatzelastizität auf die Qualitätswahl]: This section analyzes how the expected elasticity of demand influences a producer's choice of quality. In perfect polypoly, where demand is infinitely elastic at a given market price, quality choice is determined solely by cost and price comparisons. In imperfect (differentiated) polypoly, however, low elasticity can act as a barrier to quality improvement; a producer might forgo a better quality if they believe the market cannot absorb the necessary volume to offset higher unit costs. Machlup cites Chamberlin to suggest that monopolistic competition may result in lower quality products compared to pure competition. [Wirkungen von Qualitätsverbesserungen auf die Nachfrage]: Machlup classifies the effects of quality improvements on demand into three categories: 'refining' (targeting high-end customers, lowering elasticity), 'vulgarizing' (targeting mass markets, increasing elasticity), and 'popularizing' (neutral effect on elasticity but shifting the demand curve). He argues that while differentiation might hinder some improvements, it is often the necessary price for achieving higher quality standards that require specialization. Footnotes discuss how price-fixing can lead to 'luxurious' services that consumers might not choose in a free price market. [Qualitätsdeterminierung bei festen Verkaufspreisen]: This section examines quality determination when prices are fixed by law, convention, or association. Using the example of the American women's garment industry ('10.75 Dollar-Häuser'), Machlup explains how competition shifts entirely to quality and style. He introduces the concept of 'quality elasticity of sales' and demonstrates a geometric solution where quality costs are subtracted from the fixed price to create a 'net average revenue curve,' allowing for a profit-maximization analysis analogous to price competition. [Der polypolistische Wettbewerb mittels Verkaufsanstrengungen]: Machlup discusses sales efforts (advertising and promotion) as a form of non-price competition. He argues that the distinction between quality improvement and sales effort is often subjective and based on value judgments rather than economic criteria. He highlights the difficulty of measuring sales efforts and the risk of losing the independence between cost and demand functions if advertising is measured only by its cost. He suggests that sales efforts should be described physically to maintain theoretical rigor in determining optimal marketing strategies. [Dynamic or Sequence Analysis of Advertising Campaign Effects]: Machlup contrasts static and dynamic analysis regarding the sequence of advertising and price changes. He demonstrates that in a dynamic model, the order of actions (e.g., advertising before a price increase versus after) leads to different market outcomes, whereas static analysis assumes reversibility and identical end-results. [Variable Sales Costs and Net Price Sales Curves]: This section addresses the complexity of choosing between infinite alternative sales methods. Machlup proposes simplifying the problem by focusing on 'net prices' (gross price minus unit sales costs), allowing the firm to eliminate inefficient methods and derive a single relevant sales curve based on maximum net returns. [The Sales Curve as a Locus of Maximum Prices or Quantities]: Machlup defines the sales curve as the geometric locus of the highest obtainable prices for given quantities. He explains that points representing sub-optimal dynamic paths are ignored in favor of the maximum achievable results under a specific advertising budget. [Deriving the Net Sales Curve and Distinguishing Costs]: The text details methods for deriving a 'net' sales curve from various 'gross' curves. Machlup argues for subtracting sales costs from gross revenue rather than adding them to production costs, citing Abba Lerner and critiquing Edward Chamberlin's approach to maintain a clear distinction between manufacturing and marketing efficiency. [Visualizing Net Average Revenue and Sales Cost Elasticity]: Using diagrams, Machlup illustrates how to identify optimal sales methods by comparing net average revenues. He introduces the concept of 'sales cost elasticity' (or advertising elasticity), particularly relevant in differentiated polypolies with fixed prices where advertising is the primary variable for profit maximization. [Quasi-Perfect Polypoly and Horizontal Sales Curves]: Machlup analyzes the causes and limits of horizontal (perfectly elastic) sales curves. He introduces 'quasi-perfect polypoly' to describe situations where small firms act as price-takers due to price leadership or government purchase guarantees, even if the total number of sellers is small. [Historical Frequency of Polypoly and Market Evolution]: Machlup discusses the difficulty of measuring the prevalence of polypoly. He argues that while firm sizes have grown (oligopolistic tendency), the expansion of markets through urbanization and better transport has likely increased the frequency of polypolistic behavior over the last century by making competition more anonymous. [Polypoly in General Equilibrium Theory]: The author examines the role of polypoly in general equilibrium models. He argues that including differentiated polypoly (with downward-sloping sales curves) does not invalidate equilibrium theory, provided that sellers' revisions of sales expectations follow predictable principles. He concludes by emphasizing the importance of free market entry. [Chapter 7: The Pleiopoly - New Competitors in a Profitable Industry]: Machlup introduces the concept of 'pleiopoly' to describe the condition where new competitors are likely to enter a profitable industry, distinguishing it from 'polypoly' (the presence of many existing sellers). He defines an industry based on cross-elasticities of demand and supply, acknowledging the theoretical difficulties of boundary setting. The chapter provides an extensive analysis of economic profit versus accounting profit, arguing that true economic profit is a temporary phenomenon driven by uncertainty and the 'safety coefficients' entrepreneurs apply to their expectations. He further explores how physical and institutional factors like indivisibility (lumpiness) of capital and the immobility of production factors create barriers to entry that allow for persistent rents or monopoly profits, referencing thinkers like Knight, Robinson, and Triffin. [Chapter 8: The Pleiopol - Profit, Rent, and Artificial Scarcity]: This chapter explores the distinctions between profit and rent within the context of pleiopolistic competition. Machlup emphasizes the importance of ex ante calculations for potential market entrants, distinguishing between net earnings attributable to specific production factors (rent) and non-attributable earnings resulting from uncertainty or indivisibility (pure profit). He analyzes how accounting practices often obscure economic realities by capitalizing monopoly rents into asset values, thereby making 'excess' profits appear as normal returns on capital. [The Calculation of Profits: Ex Ante and Ex Post Perspectives]: Machlup discusses the theoretical necessity of separating rent from pure profit, particularly from the perspective of potential market entrants. He argues that for analyzing competition, expected (ex ante) opportunity costs are more relevant than historical (ex post) costs. Pure profit is defined as earnings that cannot be attributed to any specific asset, often arising from the 'goodwill' of a firm's market position or the indivisibility of production units that prevents new competition. [Discrepancies in Profit Calculation and Relevant Perspectives]: The text examines why profit calculations differ between established firms, potential entrants, and economists. A key source of discrepancy is uncertainty: the 'uncertainty of others' keeps competitors out, while the 'own uncertainty' of the entrant dictates their safety margins. Machlup notes that a branch might appear to have normal profits in accounting terms because monopoly rents have been capitalized into the value of assets, hiding the lack of true pleiopolistic pressure. [The Relevant Profit Calculations and the Role of the Outsider]: Machlup argues that assessing the ease of market entry requires comparing the prospects of an outsider with those of an incumbent. Entry may be deterred by higher uncertainty for the newcomer, the technical indivisibility of large production units that would cause a price collapse if added, or the scarcity of specific rights and privileges available only to established firms. [Case Study: Investment Prospectus for a Cardboard Factory]: A detailed hypothetical example of an investment prospectus for a cardboard factory is provided to illustrate ex ante profit calculation. The example includes estimates for fixed assets, working capital, and projected revenues. Machlup (as the 'economist' commentator) points out the various safety margins embedded in the estimates—such as lower price expectations and higher cost buffers—which serve to mitigate uncertainty for the investor. [Accounting vs. Economic Concepts in Profit Analysis]: Machlup clarifies the differences between accounting data and economic theory. He explains that 'direct manufacturing costs' are not identical to short-term variable costs, and that accounting 'profit' usually includes the opportunity costs of equity capital. He also discusses how rents for land or water rights are often capitalized into purchase prices, appearing as interest costs rather than distinct rents in the company's books. [The Breakdown of Total Revenue: Costs, Rents, and Profits]: This section provides a systematic breakdown of gross revenue into direct costs, asset costs, and various 'residuals' (rests). The 'Third Rest' (Net Surplus) is identified as the key metric for pleiopolistic theory, representing the excess over all economic costs (including opportunity costs of equity). Machlup explains how barriers to entry create discrepancies where incumbents see a positive third rest while outsiders see zero or negative values. [Catalog of Typical Profit Expectation Scenarios]: Machlup categorizes four types (A-D) of profit expectation discrepancies. Type A involves over-optimistic entry leading to failure. Type B represents temporary disequilibrium or non-monetary barriers. Type C is the most common, where uncertainty, technical indivisibility, or artificial barriers (like patents) protect incumbent profits by discouraging outsiders. Type D describes cases where monopoly rents are converted into accounting costs or capitalized asset values, hiding the surplus from standard view. [Monopoly Rents as Production Costs and Artificial Scarcity]: The final section of the chunk discusses how monopoly rents can be embedded in factor prices (e.g., through union-enforced wages or trade association restrictions). Machlup distinguishes between 'natural' scarcity (technical or environmental limits) and 'artificial' scarcity (institutional or legal barriers). He concludes that a broad definition of pleiopol must include the absence of artificial restrictions on the entry of all production factors, not just new firms. [Chapter 9: The Interaction of Polypoly and Pleiopoly under Perfect Conditions]: Machlup examines the theoretical synthesis of perfect polypoly (many sellers) and perfect pleiopoly (free entry). He defines group equilibrium as the simultaneous state where individual firms maximize profit (MC=P) and the industry eliminates supernormal profits (P=AC). The chapter addresses potential ambiguities in these terms, noting that 'price' and 'costs' may differ between established firms and potential entrants. Machlup also introduces a process analysis of how price expectations and cost conditions adjust over time following a demand increase, eventually leading back to an equilibrium where marginal and average costs coincide. [Group Equilibrium and Marginal Enterprises]: This section explores the concept of 'group equilibrium,' requiring both individual firm profit maximization and industry-wide elimination of excess profits. Machlup distinguishes between different meanings of the 'marginal' concept: those referring to changes in homogeneous units (marginal cost/revenue) versus those referring to heterogeneous units in a ranked order (marginal producer/land). He emphasizes that while the individual firm acts on current subjective data, the economist analyzes how these subjective estimates will be corrected by the entry or exit of capacity. [Perfect Polypoly and Perfect Pleiopoly: The Identity of Price and Costs]: Machlup details the standard proof that under perfect competition, firms produce at the point of minimum average cost where MC = P = AC. However, he warns against the 'danger of ambiguity,' pointing out that the 'price' expected by an individual seller (polypoly) might differ from the price calculated by a potential entrant (pleiopoly). Similarly, cost functions may differ between established firms and outsiders unless differential rents are accounted for. He argues that while these theories are useful, one must understand the forces that align these subjective expectations over time. [Process Analysis of Price Expectation Adjustment]: A step-by-step process analysis of how a market responds to an increase in demand under conditions of perfect polypoly and pleiopoly. Machlup categorizes producers (A through D) based on their varying price expectations—from those who view the price hike as temporary to those who expect further increases. He describes how these expectations drive output changes and investment in new capacity, eventually leading to a price decline as new supply hits the market. The analysis shows that the final equilibrium price depends on the cost conditions of the 'marginal producer' and the elasticity of supply and demand. [The Adjustment of Cost Conditions and Differential Rents]: Machlup discusses how cost functions adjust during industry expansion. While individual firms might assume constant input prices (polypsony), industry-wide growth often drives up factor prices. A central problem is the difference between marginal and intramarginal firms; the latter earn positive rents. To maintain the theoretical identity of P = AC for all firms, economists use the 'artificial' construct of 'average costs including rent.' Machlup justifies this by explaining how implicit rents tend to transform into explicit money costs (like higher leases or land prices) over time as contracts are renewed. [Full Capacity Utilization and Optimal Firm Size]: The final section analyzes the claim that perfect competition leads to optimal firm size and full capacity utilization. Machlup argues that 'capacity' and 'optimal size' are not purely technological but are functions of product prices and factor scarcity. If input supply is perfectly elastic, these values are stable; if inputs are scarce, 'optimal' size increases with demand as scarce factors (like management) are used more intensively. He distinguishes between legitimate scarcity rents (natural) and künstliche (artificial) rents caused by entry barriers, noting that perfect pleiopoly by definition excludes the latter. [Chapter 10: The Interaction of Polypoly and Pleiopoly under Imperfection]: This chapter explores the theoretical combinations of polypoly and pleiopoly when one or both are imperfect. It begins with an overview of the chapter's structure, covering topics such as excessive firm size, underutilized capacity under the tangency rule, economic losses from new competitors, and product differentiation as a barrier to entry. Machlup sets the stage for analyzing how competition types interact when the ideal conditions of perfect competition are relaxed. [Perfect Polypoly and Imperfect Pleiopoly: Excessive Size and Output]: Machlup analyzes the rare but theoretically significant case of perfect polypoly combined with imperfect pleiopoly, using agricultural land restrictions as a primary example. He argues that when entry is restricted (imperfect pleiopoly) but firms act as price-takers (perfect polypoly), there is a tendency toward inefficiently large output and firm sizes. In this state, marginal costs equal price, but price remains above average costs, leading to production beyond the point of economic optimality and the generation of rents based on artificial scarcity. [Diagrammatic Analysis of Perfect Polypoly and Imperfect Pleiopoly]: This segment provides a geometric representation (Figure 16) of a firm under perfect polypoly and imperfect pleiopoly. It demonstrates that because entry is blocked, the price-demand curve is not pushed down to the tangency point of the average cost curve. The firm produces at a point where marginal cost equals price, resulting in output that exceeds the minimum cost volume and generates a surplus (monopoly rent) that the economist distinguishes from legitimate costs. [Imperfect Polypoly and Perfect Pleiopoly: The Tangency Rule and Excess Capacity]: Machlup examines the combination of imperfect polypoly and perfect pleiopoly, a cornerstone of monopolistic competition theory developed by Robinson and Chamberlin. He explains the 'tangency rule,' where free entry (perfect pleiopoly) eliminates excess profits, forcing the downward-sloping demand curve of the differentiated seller to be tangent to the average cost curve. This results in firms being 'inefficiently small' with unutilized capacity, as they produce to the left of the minimum point on the cost curve. The segment also discusses the complexities of adjusting sales expectations in a differentiated market. [Interpretations of the Tangency Rule and Differential Rents]: Machlup critiques the tangency rule, offering four distinct interpretations ranging from empirical tendencies to tautological definitions. He discusses the role of differential rents, noting that if rents for scarce factors (like managerial talent) are included in costs, the tangency position is achieved by shifting the cost curve upward rather than the demand curve downward. He references the debate between Kaldor and Robinson regarding whether this represents true 'excess capacity' or merely a definitional outcome. The segment concludes that while the theory suggests inefficiency, the actual deviation from the optimum may be negligible if demand is highly elastic. [Economic Waste and the Nine Reasons for Decreasing Costs]: This section analyzes the 'waste' associated with imperfect polypoly and perfect pleiopoly, where competition leads to higher unit costs due to underutilized capacity. Machlup details nine specific technological and commercial reasons for decreasing average costs, such as the indivisibility of machinery, bulk buying discounts, specialized labor, and fixed overhead. He weighs the disadvantage of higher costs against the advantage of product variety, questioning whether consumers would truly prefer cheaper standardized goods if given the choice. He also notes that while these costs represent a social loss, they often manifest as a dissolution of monopoly profits rather than higher consumer prices. [Advantages of Pleiopoly and the Critique of Entry Restrictions]: Machlup identifies three additional reasons for higher costs in differentiated markets (advertising, lack of specialization, and factor price increases) but contrasts these with six intangible benefits of pleiopoly. These benefits include greater consumer choice, decentralization of economic power, and the 'salutary discipline' that competition imposes on potentially negligent entrepreneurs. He argues strongly against using entry restrictions to prevent 'wasteful' capacity, as such restrictions protect monopoly profits and hinder the dynamic efficiency that allows more rational producers to replace inefficient ones. [Imperfect Polypoly and Imperfect Pleiopoly: Political and Strategic Barriers]: The final section of the chapter discusses the combination of imperfect polypoly and imperfect pleiopoly. Machlup explores whether product differentiation naturally creates entry barriers or if these barriers are primarily political, resulting from lobbying by interest groups for 'fair' competition and entry regulations. He references historical views on 'polypoly' as overcrowding (Becher) and analyzes the effects on total industry output. Finally, he distinguishes between polypolistic behavior and the strategic use of low prices to deter entry, concluding that the latter is a characteristic of oligopoly rather than polypoly. [Kapitel 11: Merkmale und Einteilungsprinzipien des Oligopols - Wortbildung]: This section introduces the concept of oligopoly, tracing its linguistic and theoretical origins. It discusses early mathematical treatments by Cournot and the evolution of terminology from 'limited competition' to the modern acceptance of 'oligopoly' and 'duopoly'. [Merkmale des Oligopols: Monopolmacht und die Abgrenzung zum Polypol]: Machlup defines the characteristics of oligopoly, emphasizing that it is defined by the subjective attitude of the seller (rivalry consciousness) rather than objective numbers. He distinguishes it from polypoly and monopoly based on how a seller anticipates and reacts to competitors' actions. [Die Kritik der Preis-Absatzkurve im Oligopol]: The author critiques the over-reliance on price-demand curves and mathematical cross-elasticities to define oligopoly. He argues that the 'kinked demand curve' is a special case and that oligopolistic behavior involves complex expectations, risks, and non-price variables like quality and advertising that curves cannot easily capture. [Doppelrollen und Klassifikationen des Oligopols]: Machlup explains how firms can simultaneously hold multiple market positions (monopoly, oligopoly, polypoly) across different products. He then provides a comprehensive overview of classification principles for oligopolies, including product differentiation, barriers to entry, leadership roles, and the degree of coordination. [Koordinationsgrade und Zustände: Kampf, Waffenstillstand und Friede]: This final section of the chapter categorizes oligopolies by their degree of coordination (perfect, imperfect, or uncoordinated) and their state of conflict (struggle, truce, or peace). Machlup distinguishes between the 'collective monopoly' of a cartel and a single-headed monopoly, noting that while theory focuses on uncoordinated struggle, reality often shows stable coordination. [Kapitel 12: Die klassischen Dyopoltheorien und ihre modernen Weiterentwicklungen]: This introductory section of Chapter 12 outlines the history and methodological foundations of classical duopoly theories. Machlup introduces the models of Cournot, Bertrand, and Edgeworth, arguing that while they are mathematically constructed 'school models,' they require translation into common language and 'imaginary introspection' to be truly understood. He establishes a hypothetical price-demand table to serve as a consistent basis for comparing these three models throughout the chapter. [Das Cournot-Modell: Analyse und Arithmetische Demonstration]: Machlup provides a detailed step-by-step arithmetic demonstration of the Cournot model based on specific assumptions: quantity-based competition, lack of information about the competitor's intentions (zero conjectural variation), and homogeneous products. Through a series of 'periods,' he shows how two suppliers (A and B) adjust their output until a stable equilibrium is reached at two-thirds of the competitive output level. The section includes detailed tables showing profit maximization steps for each supplier. [Das Bertrand-Modell: Preiswettbewerb und Ruinöse Konkurrenz]: This section analyzes the Bertrand model, where competition is based on price rather than quantity. Machlup demonstrates how the assumption that each supplier expects the other to maintain their price leads to a continuous price war. This process only stops when the price reaches the marginal cost (DM 0.10), resulting in an equilibrium identical to perfect competition (polypoly), despite there being only two suppliers. [Das Edgeworth-Modell: Kapazitätsbeschränkungen und Oszillation]: Machlup explores the Edgeworth model, which introduces limited production capacity into the price-setting framework. Because neither supplier can satisfy the entire market alone, the price war does not end at marginal cost. Instead, once prices drop low enough, it becomes more profitable for a supplier to jump back to a high monopoly price to serve the 'residual demand.' This creates a perpetual cycle of gradual price decreases followed by sudden jumps, resulting in an oscillating market without a stable equilibrium point. [Vergleich der klassischen Modelle und Analyse der Marktbedingungen]: Machlup compares the outcomes of the three classical models regarding price, quantity, and behavioral assumptions. He introduces the concept of 'conjectural variation of zero' (Ragnar Frisch/William Fellner) to describe the suppliers' failure to anticipate reactions. He also addresses the 'paradox' of non-uniform prices in the Edgeworth model, explaining it through market imperfections and the sequential nature of sales when capacity is limited. The section concludes by critiquing the 'symmetrical' assumptions of these models as unrealistic in practice. [Erweiterungen der klassischen Modelle: Von Symmetrie zu Asymmetrie]: This final section of the chunk discusses modern extensions of classical duopoly theory. Machlup examines how changing assumptions—such as introducing product differentiation, non-linear costs, and asymmetrical behavior (leader-follower roles)—makes the models more realistic. He critiques the Bowley model's 'symmetrical superiority complex' and discusses the role of non-price variables like quality and advertising. Finally, he addresses the transition from duopoly to oligopoly, noting that increasing the number of suppliers does not necessarily lead to more competitive results if the behavioral 'attitude' of the suppliers remains non-polypolistic. [Kapitel 13: Oligopolistische Indeterminiertheit und Kollusion]: This chapter explores the concept of 'oligopolistic indeterminacy' and the various forms of collusion. Machlup distinguishes between pure and applied economic theory, noting that indeterminacy often arises when models lack specific data on individual behavior or non-economic factors like prestige and security. He discusses the application of game theory (Von Neumann and Morgenstern) to oligopoly, comparing it to military strategy (Clausewitz). The section also details the 'degrees' and 'forms' of collusion, ranging from informal 'gentlemen's agreements' and quasi-agreements to formal cartels and syndicates. Finally, he addresses the incompatibility of oligopoly theory with general equilibrium models, arguing that both have distinct methodological purposes. [Chapter 14: Oligopolistic Non-Price Competition and Price Rigidity]: This chapter explores the dynamics of non-price competition and price rigidity within oligopolistic markets. Machlup distinguishes between various non-price variables such as quality, advertising, customer service, and credit terms, noting that technological factors often dictate the limits of quality competition. He argues that price rigidity is not an inherent feature of oligopoly but often results from the high costs of price changes, the need for collective agreement in coordinated groups, or the strategic fear of competitor reactions. The chapter critically examines the 'kinked demand curve' theory, suggesting it primarily explains why non-leaders in loose groups avoid independent price changes rather than explaining the price policy of the group as a whole. [Chapter 15: Organized, Leadership, and Unorganized Oligopoly]: This introductory section of Chapter 15 outlines a classification system for oligopolies based on their degree of coordination, ranging from syndicated and organized forms to leadership and uncoordinated types. Machlup defines organized oligopoly by the presence of agreements or collective action through agencies, noting that coordination levels do not necessarily correlate with the complexity of the organizational apparatus or the proximity to a perfect monopoly. [Types of Organized Oligopoly and the Approximation of Monopoly Policy]: Machlup discusses various forms of organized competition restrictions, collectively termed cartels, such as price-fixing agreements and quota systems. He argues that higher coordination does not always lead to the 'ideal' goal of joint profit maximization; in fact, uncoordinated market division might sometimes yield higher total profits than a centralized syndicate due to the costs of managing divergent member interests and production inefficiencies. [The Economics of Syndicate Policy]: This section analyzes the internal economic logic of sales syndicates. Machlup explains that syndicates operate differently than single monopolists because they must balance the divergent marginal costs and interests of various members. The policy is often a political compromise rather than a pure economic optimization of total group profit, focusing on balancing quotas and reconciling members' demands for volume versus price. [Decisions within Price Cartels and Member Behavior]: Machlup outlines a systematic framework for cartel theory, distinguishing between the behavior of individual members (under given or changing agreements) and the behavior of the cartel authority. He emphasizes the interdependence between political negotiations within the cartel and the economic market behavior of its members, while noting the role of potential new entrants (pleiopoly) in shaping cartel policy. [Member Behavior under Fixed Cartel Rules and Secret Price Cutting]: This segment examines how individual firms behave when faced with fixed cartel prices and quotas. Using Figure 23, Machlup analyzes the incentives for 'conditionally obedient' members to offer secret rebates. He demonstrates how the inclusion of risk premiums for potential penalties affects the perceived average and marginal revenue of a firm considering violating cartel agreements. [The Impact of Quota Systems and Penalties on Production]: Machlup explains how percentage-based quota systems, enforced through penalties for overproduction and premiums for underproduction, effectively restrict total industry output. These financial sanctions lower the marginal revenue for individual firms, incentivizing them to reduce production and decreasing the drive for non-price competition like quality improvements or advertising. [Produktionseinschränkung auf Grund von Strafandrohung für Quotenüberschreitung]: Machlup analyzes how penalties for exceeding quotas and rewards for under-fulfillment affect the marginal revenue and production levels of cartel members. He argues that such systems, whether based on financial penalties or social sanctions (honor codes), lead to production restrictions unless marginal costs are significantly lower than the cartel price. He also discusses specific mechanisms like the purchase of products from under-performing members to neutralize excess sales incentives. [Das Verhalten der Kartellmitglieder in Erwartung von Neuverhandlungen]: This section examines how the anticipation of future quota renegotiations influences current behavior. Members may intentionally exceed quotas or over-expand production capacity to demonstrate a need for higher future allocations. Machlup notes that while these actions might seem competitive (leading to lower prices or technical improvements), they are strategic maneuvers within the cartel framework rather than true competition, and their restrictive effects are only mitigated by the potential instability of the cartel. [Die Theorie der Kartellverhandlung und Kartelleitung]: Machlup discusses the lack of a developed theory of cartel negotiations, partly due to the secrecy necessitated by anti-trust laws. He categorizes cartel governance into direct democracy, representative democracy, oligarchy, or a single leader ('Czar'), noting that the structure often depends on the number of members and the nature of the decisions being made. [Das Führerschaftsoligopol: Begriffe und Befähigung]: An analysis of price leadership within oligopolies, distinguishing between organized and non-organized forms. Machlup defines leadership based on follower behavior and categorizes leaders as dominant (market-dominating), barometric (market-sensing), or appointed. He explores the psychological and economic motivations that lead firms to accept a leader's pricing, including fear of retaliation or the desire for orderly market conditions. [Das Teilmonopol und das Teiloligopol]: Machlup distinguishes between 'partial monopoly' (one large firm with many small 'quasi-polypolistic' competitors) and 'partial oligopoly' (a few large firms sharing the remaining market). He argues that a dominant firm faces a more elastic demand curve when small competitors are present, potentially leading to lower prices than in a fully coordinated oligopoly. He suggests that strengthening small firms might paradoxically lead to higher prices if they grow enough to adopt oligopolistic 'responsibility' for market order. [Abwechselnde Führerschaft und Nicht-organisierte Zusammenarbeit]: This segment explores how firms mask collusion through alternating or shared leadership and non-organized cooperation. Machlup notes that social contacts, trade journals, and a 'live and let live' mentality can coordinate behavior without formal agreements. He remains skeptical of claims that price leadership is truly unorganized, suggesting most cases are covertly organized oligopolies. [Typen des nicht-koordinierten Oligopols: Kampf, Überkonkurrenz und Kettenoligopol]: Machlup identifies four types of non-coordinated oligopoly: 1) 'Kampfoligopol' (aggressive price wars for market dominance), 2) 'Überkonkurrenz' (hyper-competition in sectors with many firms and secret deals), 3) 'Kettenoligopol' (chain relationships where firms only react to immediate 'neighbors'), and 4) 'Ratespiel-Oligopol' (a guessing game of moves and counter-moves). He critiques Stackelberg's theory of market conflict and introduces the relevance of game theory (von Neumann and Morgenstern) for analyzing these uncertain interactions. [Historische Entwicklungslinien des Oligopols]: Machlup reflects on whether oligopoly has increased over time. He argues that while the economic literature on the subject has grown, the historical reality is complex. Improvements in transport in the 19th century initially broke down local oligopolies by expanding markets, but the subsequent growth of firm size and the merger movement of the late 19th century led to a resurgence of oligopolistic structures and market dominance. [Chapter 16: Oligopoly in Connection with Pleiopoly]: This chapter explores the interactions between oligopoly (few sellers) and pleiopoly (probability of new entrants). Machlup analyzes how the threat of new competition can destabilize cartels or force established firms to lower prices, increase costs, or create artificial barriers to entry. He distinguishes between the resilience of mergers versus cartels under pleiopolistic pressure, noting that while cartels often collapse when new entrants appear, large consolidated firms can often absorb or deter them. The text also discusses the concept of 'limit pricing'—setting prices just low enough to discourage entry—and the economic justification of restrictive practices in over-expanded industries during depressions. [Part Seven: A Single Seller]: A brief transitional marker indicating the start of the seventh part of the book, which focuses on monopoly or the single seller model. [Chapter 17: The Monopoly]: This chapter provides a comprehensive analysis of monopoly as a market position where a single seller operates without awareness of specific competitors. Machlup distinguishes between 'pure' monopoly and 'imperfect' monopoly, the latter being constrained by potential competition, state sanctions, or bilateral negotiations. He explores the psychological dimensions of monopoly, contrasting the 'unconcerned' monopolist, who may pursue non-pecuniary goals like social prestige, with the 'pessimistic' monopolist, whose fear of imminent competition leads to short-term profit maximization and the suppression of technical progress. The text also critiques various definitions of monopoly based on demand elasticity and cross-elasticity, arguing that true monopoly is rare because most sellers face some degree of substitution or potential entry. [Index (Register)]: A detailed alphabetical index (Register) for the entire work 'Wettbewerb im Verkauf'. It includes key economic terms, concepts (such as 'Grenzkosten', 'Oligopol', 'Pleiopol'), and names of cited authors (such as 'Chamberlin', 'Cournot', 'Keynes', 'Stackelberg'). The index serves as a navigational tool for the theoretical models and empirical discussions presented throughout the book.