Source: Ludwig von Bertalanffy (1901-1972) (1989), p. 2, footnote 4.
“The proof of the pudding is in the eating. There was a widespread myth of the 1970s, a myth along Tom Kuhn’s (1962) Structure of Scientific Revolutions lines. The Keynesianism, which worked so well in Camelot and brought forth a long epoch of price-level stability with good Q growth and nearly full employment, gave way to a new and quite different macro view after 1966. A new paradigm, monistic monetarism, so the tale narrates, gave a better fit. And therefore King Keynes lost self esteem and public esteem. The King is dead. Long live King Milton!
Contemplate the true facts. Examine 10 prominent best forecasting models 1950 to 1980: Wharton, Townsend–Greenspan, Michigan Model, St. Louis Reserve Bank, Citibank Economic Department under Walter Wriston’s choice of Lief Olson, et cetera. … M did matter as for almost everyone. But never did M alone matter systemically, as post-1950 Friedman monetarism professed.”
New millennium, An Interview with Paul A. Samuelson, 2003
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American economist 1915–2009Related quotes
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 177
Context: Closely related to the problem of the parallel postulate is the problem of whether physical space is infinite. Euclid assumes in Postulate 2 that a straight-line segment can be extended as far as necessary; he uses this fact, but only to find a larger finite length—for example in Book I, Propositions 11, 16, and 20. For these proofs Heron gave new proofs that avoided extending the lines, in order to meet the objection of anyone who would deny that the space was available for the extension.
Hulme and Modrern Poetry' in ' T E Hulme ',Carcanet Press,Manchester, 1982

'The Transition from Capitalism' in Richard Crossman (ed.), New Fabian Essays (Turnstile Press, 1952), pp. 39–40
Source: Where the Wild Things Are

“The proof of the pudding is in the eating.”
Source: Don Quixote de la Mancha (1605–1615), Part I, Book IV, Ch. 10.