EDGEWORTH, Francis Ysidro.

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Papers Relating to Political Economy. First edition, the three volumes constituting practically all of Edgeworth's work in economic theory. "Edgeworth's contribution to economics left their mark on the theories of monopoly, foreign trade, taxation and production. In production theory, earlier authorities had generally employed the concept of an average product to demonstrate diminishing returns. It was Edgeworth who insisted on the distinction between the average and the marginal product and who understood the significance of the latter in connection with the identification of the maximum position" (Spiegal). "Edgeworth has always been regarded as an exceptionally distinguished 'all-rounder', making major contributions to both economic and statistical theory to a degree that no one else, with the possible exception of Harold Hotelling, has ever approached. Since 1960, however, serious reappraisal of the depth and subtlety of those contributions to each discipline has shown decisively that he was indeed one of the truly great economists of his time, and one of its greatest statisticians" (ODNB). From the library of D. A. E. Harkness, assistant professor of economics at Queen's University, Belfast, from 1924 member of the Northern Ireland Ministry of Agriculture.

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