Murray N. Rothbard · 2002
Rothbard’s essay attempts to rebuild utility and welfare economics by stripping them of measurable utility, hypothetical preference schedules, and aggregate social welfare. Its methodological premise is that economics begins not with psychic magnitudes or collective entities but with purposive individual action.
Individual valuation is the keystone of economic theory.
From this premise Rothbard develops “demonstrated preference”: only actual choice can reveal preference, and only for the moment in which the choice occurs. This distances him both from positivist demands that economics imitate physics and from Samuelson’s revealed-preference theory, which he sees as illicitly assuming stable preference orderings across time. The economist may infer that an actor preferred what he chose to the available alternative, but not construct a complete mental scale, rely on questionnaires, or treat imagined choices as data.
actual choice reveals, or demonstrates, a man's preferences
This rule governs Rothbard’s reconstruction of utility theory. Utility is ordinal, not cardinal: action shows ranking, not intensity, and subjective valuation has no unit of measurement. Yet he also rejects the Hicks-Allen ordinalist apparatus of indifference curves, because indifference is never enacted as preference. If a person chooses, the choice demonstrates preference; if no preference is demonstrated, economic analysis has no basis for plotting an indifference relation.
Indifference can never be demonstrated by action. Quite the contrary.
Rothbard’s marginal utility theory follows the same anti-formalist logic. The “marginal” unit is simply the unit relevant to the actor’s concrete choice, whether one egg, a dozen eggs, or a carton. Hence he rejects the mathematical contrast between total and marginal utility and treats all utility as tied to discrete acts of choosing. His criticism of von Neumann-Morgenstern expected utility extends this point: the theory depends on numerical utilities, stable preferences, and probabilities for unique human actions, all of which exceed what choice can demonstrate.
The second half applies demonstrated preference to welfare economics. Rothbard accepts Robbins’s and Pareto’s warning that economists cannot make interpersonal utility comparisons or derive ethical judgments from economic science alone.
economics per se cannot establish ethical judgments.
Old welfare economics failed by comparing the marginal utility of money across persons; new welfare economics fails, in Rothbard’s view, by hiding the same problem behind compensation tests, social welfare functions, and advisory formulas. Potential compensation does not prove actual welfare gain, actual compensation still cannot disclose unchosen interpersonal rankings, and a social welfare function either smuggles in ethics or imagines a nonexistent social chooser.
Rothbard’s alternative welfare criterion is unanimity as demonstrated in voluntary exchange. If two parties exchange, each party’s action shows an expectation of gain; a network of voluntary exchanges therefore permits the economist to say, without interpersonal measurement, that social utility has increased for all participants. The free market is not idealized as a psychological harmony but defined as the institutional field of noncoercive exchanges whose mutual gains are demonstrated by their occurrence.
Coercive intervention has the opposite status. Redistribution and regulation may benefit some, but they also impose losses on others without their demonstrated consent. Since the state operates through taxation, compulsion, and monopoly, its acts cannot meet the unanimity criterion. Rothbard therefore reaches his sharpest welfare conclusion:
no act of government whatever can increase social utility.
He applies this conclusion against theories of democratic consent, public goods, and free-rider failure. Majority rule is not unanimity; state provision cannot be redescribed as voluntary merely because some beneficiaries approve; and unpaid external benefits are not evidence of market failure, since uncompensated benefits pervade ordinary social life. The essay’s final stance is thus formally Wertfrei but substantively radical. Economics alone cannot found an ethics of laissez-faire, yet once it confines itself to demonstrated preference, it can affirm welfare gains only where voluntary exchange occurs and must deny scientific welfare status to coercive intervention.
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