Trucks waiting at the German-Polish border, March 2020
Reuters

Which has a more complete single market, the United States or the European Union? Conventional wisdom suggests an obvious answer: the United States. Since 1789, the American federation has pursued its founding mission to guarantee the free flow of interstate commerce. Although many of today’s American progressives want to copy heavy-handed European models of regulation and social welfare, they confront well-organized free marketeers and business interests determined to defend the United States’ system of open capitalism.

Across the Atlantic, Europe’s much newer “single-market project” was conceived in envious imitation of the dynamic American economy. Although Brussels has removed many

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