During the Great Depression, America's protectionist Smoot-Hawley Act of 1930 raised tariffs on more than 900 goods. A series of retaliatory actions by other countries followed. The effect on global commerce was devastating. In the three years to June 1932, the volume of world trade shrank by over a quarter. No wonder, then, that the spectre of the worst recession since the Depression led many to fear another descent into protectionism and a similar decline in trade.
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