But then the Great Depression hit, followed by the Second World War. In the wake of the war, when Western powers gathered at the Bretton Woods Conference in New Hampshire to decide how to prevent such a catastrophe from recurring, they set up the General Agreement on Tariffs and Trade (GATT). John Maynard Keynes, the key figure at the conference, argued that the rise of protectionism across the industrialised world had contributed to low aggregate demand: people weren’t buying enough stuff because prices were too high, and the economy ground to a halt. For Keynes, excess protectionism was a
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