This graph comes from Mark J. Perry's blog Carpe Diem.
The graph shows the volume of U.S. exports of goods and services, in inflation-adjusted dollars, annually from 1929 to 1945. The effects of protectionism - the Smoot-Hawley Tariff Act of 1930 - are roughly the same as the effects of war - World War 2. Trade protection amounts to making economic war on yourself.
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