In _The Big Three in Economics_, Mark Skousen says in footnote 2 on p. 137: With Keynes came the division of "macroeconomics," the study of economic aggregates such as the price level, the money supply, and Gross Domestic Product, and "microeconomics," the theory of individual and firm behavior. Paul Samuelson, who did not use the term in the first edition of his textbook, _Economics_ (1948), says the distinction between "micro" and "macro" goes back to econometricians Ragnar Frisch and Jan Tinbergen, the first Nobel Prize winners in economics. But Roger Garrison notes that the Austrian economist Eugen Bohm-Bawerk wrote this sentence in January, 1891: "One cannot eschew studying the microcosm if one wants to understand properly the macrocosm of a developed country" (Bohm-Bawerk 1962: 117). Humberto Barreto