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Reversals of Assumptions and Implications

Louis De Alessi

Journal of Political Economy 1971

The possibility that assumptions and implications may be interchanged has been interpreted by some economists to imply that assumptions can be required to have direct empirical meaning. Such an interpretation is incorrect. Section I summarizes the methodological viewpoint adopted in this essay. Section II contains a discussion of different types of reversals associated with different meanings of assumption. Section III concludes that purported reversals of assumptions and implications do not affect the empirical characteristics of the statements involved and do not cast doubt upon the proposition that the usefulness of economic theory must be judged by the agreement of the theory's logical consequences with observation.

DOI
10.1086/259793
Volume
79 (4)
Pages
867-877
Language
en
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