This is an economic research monograph on consumer instalment credit and business-cycle theory, supplemented by a technical appendix by Samuelson. Its scope is not a broad history of consumer finance but a focused inquiry into how short- and intermediate-term consumer credit enters aggregate expenditure, how it moves over the cycle, and whether it should be treated as an independent cause of fluctuations or mainly as a dependent amplifier.
Haberler begins by narrowing the object of analysis. Instalment credit is not all consumer borrowing; it is a specific institutional form with scheduled repayment, finance charges, short maturity, and legal enforceability.
Consumer instalment credit, as the term is employed in this series of studies, is characterized as follows: first, it signifies credit that is used for consumption purposes; second, it is repayable in regular, prescheduled amounts; third, it carries a charge for the financing service rendered; fourth, its stipulated period of repayment is a relatively short or intermediate interval of time; and finally, it is attested by a negotiable instrument providing for legal action in case of default on repayment.
The central analytical move is to shift attention from the stock of credit outstanding to the flow relation between new credits and repayments. What matters for fluctuations is not merely how much debt exists, but whether current extensions exceed current repayments. That net increment finances purchases that otherwise might not occur at that moment, and so enters macroeconomic demand directly.
Therefore net credit change measures the direct contribution of instalment credit not only to consumer expenditure, but also to aggregate expenditure (“effective demand”).
This formulation makes instalment credit neither trivial nor omnipotent. It can add to demand in expansion and subtract from it in contraction, especially because durable-goods purchases are cyclically sensitive. Yet Haberler resists the view that instalment credit is the primary motor of the business cycle. Its movements are largely induced by income, employment, sales prospects, and consumer confidence. His aphorism captures the causal hierarchy:
The dog wags the tail and not the tail the dog.
The work’s structure follows from this distinction. First it defines the credit form; then it decomposes instalment credit into new lending, repayments, net change, and credit outstanding; then it considers the timing and amplitude of these series across expansions and contractions. The result is a theory of credit as a transmission mechanism: instalment finance can intensify movements in consumption and effective demand, but it generally follows broader cyclical forces rather than originating them.
Samuelson’s appendix formalizes this logic. Outstanding instalment credit is represented as a lagged weighted sum of past new credits, because repayments retire earlier loans according to their amortization schedule. This explains why the outstanding stock moves more smoothly than new extensions and why its turning points lag.
Under these mild conditions the following definite theorem can be enunciated: the peaks and troughs of total credits outstanding will lag behind the respective peaks and troughs of the new credits series; the lag of the turning points cannot, however, be larger than the interval between such a turning point and the succeeding trend value.
The formal appendix also clarifies Haberler’s analogy with the acceleration principle. Just as investment can respond disproportionately to changes in consumption, instalment credit converts changes in durable-goods buying into magnified changes in credit extension and repayment flows.
This turns out to be precisely the same formal relationship as the acceleration principle postulates between the rate of increase of consumption and net investment.
The study’s relevance lies in this disciplined middle position. Haberler gives consumer instalment credit a definite place in fluctuation theory without exaggerating its autonomy. Credit policy, repayment terms, and instalment finance matter because they shape the timing of expenditure and repayment burdens; but explanation must begin with the broader cycle of income and spending. The book thus anticipates later flow-of-funds and demand-management approaches: it treats consumer credit as a measurable channel through which expectations, durable consumption, and aggregate demand interact.
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