The greatest debate in the history of economics began with a simple request for a book. In 1927, Friedrich von Hayek, then a young Viennese economist, wrote to the already famous professor John Maynard Keynes at King’s College in Cambridge (England), asking for an economic textbook written by Francis Ysidro Edgeworth and titled “Mathematical Psychics an Essay on the Application of Mathematics to the Moral Sciences.”
Keynes replied with a single line on a plain postcard: “I am sorry to say that my stock of ’Mathematical Psychics’ is exhausted.”
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