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surplus, the device of splitting time into market, short and long periods all of these and much else e to us from Marshall, mainly through his famous Principles. The book was first published in 1890 and it went through eight editions in his lifetime. ? His insights into theory and his sound philosophy bined still have much to mend themselves to us, his pupils at Cambridge. 貨幣銀行學(xué) 第七章 30 Keynes, John Neville (18521949) ? Keynes was educated at the universities of London and Cambridge. After graduating from Cambridge (1875), he was a lecturer in moral science there (18841911) and then served as registrar of the university (191025). He was active in the foundation of the Economics Tripos at Cambridge. ? Keynes’s most important contributions to economics were as a logician and methodologist. His two chief works are Studies and Exercises in Formal Logic (1884), which was popular for its clarity of expression and avoidance of mathematical symbolism, and his classic work on economic methodology, The Scope and Method of Political Economy (1891). This work categorised the various approaches to economics as inductive and deductive, with Keynes adopting a syncretistic position. At a time when the Germanspeaking world was engaged in the Methodenstreit (battle of methods) between the Austrian economic school led by Carl Menger, which advocated a deductive approach and stressed the importance of pure theory, and the followers of German economist Gustav Schmoller, who insisted on the importance of inductive studies, Keynes, by contrast, insisted that both induction and deduction were required. He felt that inductive reasoning provided the general