Rothbard’s essay is a methodological argument about what economics can and cannot do in public controversy. He distinguishes ethics, which concerns proper ends, from praxeology, which analyzes purposive action and the consequences of means chosen to attain ends.
Ethics is the discipline, or what is called in classical philosophy the "science," of what goals men should or should not pursue.
On this view, economics is not hostile to values; it is dependent on them as givens. If a person seeks health, medicine may identify effective means; if citizens seek abundance, economics may explain the effects of price controls, taxation, or intervention. But economics does not itself establish that health, abundance, equality, power, or liberty ought to be pursued. Its scientific status rests on abstaining from the economist’s own preferences.
Furthermore, praxeology is not grounded on any value judgments of the praxeologist, since what he is doing is analyzing the fact that people in general have values rather than inserting any value judgments of his own.
Rothbard’s main target is therefore the economist who turns policy preference into alleged science. Public-finance arguments for equality, progressive taxation, or redistribution may be coherent moral positions, but they are not made value-free by technical vocabulary or appeals to consensus. The honest economist who recommends policy has only two legitimate routes: either declare the recommendation as personal valuation, or supply an explicit ethical theory outside economics.
That leaves him with the first choice: to make crystal clear that he is speaking not as an economist but as a private citizen who is making his own confessedly arbitrary and ad hoc value pronouncements.
The essay also rejects the idea that “technical advice” is morally neutral. To advise a firm, a patient, or a state about efficient means is already to participate in the end being served. Rothbard uses medical and political examples to show that expertise cannot evade ethical conflict when the proposed means violate other ends or persons.
Two examples will reveal how ethical conflicts may arise: first, the patient needs a new kidney to continue to live; is it ethical for the physician and/or the patient to murder a third party and extract his kidney?
This reasoning carries into Rothbard’s critique of welfare economics. Unanimity rules appear value-free but privilege the status quo; compensation tests fail because gains and losses are subjective and cannot be measured interpersonally. Demonstrated preference permits only narrow conclusions from actual action: voluntary exchange shows that the participants expected to gain, while coercive state action necessarily imposes losses on at least some persons. Yet even this cannot prove laissez-faire as a purely scientific conclusion, because valuing “social utility” or voluntary gain over envy, domination, or egalitarian leveling is itself ethical.
The closing test case is Mises. Rothbard praises Mises’s praxeology but argues that Mises’s utilitarian defense of liberalism cannot be derived from value-free economics alone. Intervention can be shown to frustrate certain ends if those ends are assumed, but interventionists may prefer other goals, including equality, power, resentment, or sacrifice of prosperity. Thus Rothbard’s conclusion is anti-positivist and anti-utilitarian: economics clarifies consequences and exposes fallacies, but the case for liberty requires an objective ethics beyond praxeology.
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