题目内容
If a customs union included all of the countries in the world, there could exist only trade creation, not trade diversion.
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The large the size and the greater the number of countries in a customs union, the greater will be the trade-diversion effect.
Over the long run, the formation of a customs union may yield welfare gains due to economies of scale, greater competition, and stimulus to investment.
By the mid-1990s, the European Union had essentially achieved the common market stage of economic integration.
At the Maastricht Summit of 1991, members of the European Union expressed the goal of achieving the common market stage of economic integration.
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