"The basic sources of the defects in Lange's theoretical analysis are the emphasis on formal structure, the attempt to generalize without first specifying in detail the facts to be generalized, and the failure to recognize that the ultimate test of the validity of a theory is not conformity to the canons of formal logic but the ability to deduce facts that have not yet been observed, that are capable of being contradicted by observation, and that subsequent observation does not contradict. In consequence, these defects are found in much economic theorizing that is not taxonomic in character. They are, however, especially likely to arise when the taxonomic approach is adopted, as their presence in the writings of so able and careful a theorist as Lange testifies."
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Milton Friedman, "Lange on Price Flexibility and Employment: A Metgodological Criticism", The American Economic Review, Vol. 36, No. 4 (Sep., 1946)
https://en.wikiquote.org/wiki/Oskar_R._Lange
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Oskar R. Lange
Oskar Ryszard Lange (July 27, 1904 – October 2, 1965) was a Polish economist and diplomat. He was most known for advocating the use of market pricing tools in socialist systems and providing a model of market socialism.
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