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The author traces the various stages in the development of a viable measure of the netproduct. Beginning with Petty's seminal exposition of the problem, the paper then analyzesthe Physiocratic fixed-price composite-commodity measure, the Smith-Keynes 'labour command'approach, and the Ricardo-Sraffa 'standard commodity' method of defining the net product.Although being the most accurate of the various techniques, the author concludes thatSraffa's method did not solve all the measurement problems raised by the classicaleconomists

Keynes, Sraffa et l’économie classique : le problème de la mesure de la valeur