Anti-trade graffiti in Brussels, Belgium, July 27, 2015.
Francois Lenoir / Reuters

In the past, it was easy to make the case for free trade. Countries that reduced tariffs and opened their borders for new products and ideas were usually better off than those that shut their markets off. Free trade agreements seemed to create opportunities, help millions out of poverty, and generate growth. More trade, to cut a long story short, made the world a better place.

Today, a growing number of Europeans and Americans believe that the opposite is true. Free trade agreements have become increasingly unpopular. For example, last autumn, about 250,000 Germans demonstrated in Berlin against the Transatlantic Trade

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