The whole of economics can be reduced to a single lesson, and that lesson can be reduced to a single sentence:
The art of economics consists in looking not merely at the immediate but at the longer effects of any act or policy; it consists in tracing the consequences of that policy not merely for one group but for all groups.
Excerpted from Economics in One Lesson, pp. 3-7.
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Henry Hazlitt (1894–1993) was a well-known journalist who wrote on economic affairs for the New York Times, the Wall Street Journal, and Newsweek, among many other publications. He is perhaps best known as the author of the classic, Economics in One Lesson (1946).