The core of Europe's single market-a ban on tariffs, quotas, and subsidies, protected by the Schengen Agreement prohibiting border controls and competition policy-seems to be holding firm.

欧洲单一市场的核心——关税，配额和补贴的禁令，受禁止边界控制和竞争政策的申根条约保护——看上去得到了坚决执行。

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In 2009 Mexico imposed tariffs on $2.3 billion of American goods, after the United States stopped letting Mexican lorries past the border area.

2009年，在美国禁止墨西哥货车越过边境后，墨西哥对美国货物收取了价值23亿美元的关税。

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Yet, even ignoring the tariffs and other restrictions still in place, cross-border trade remains tiny as compared with the volume of goods and service traded within countries;

然而，即使忽略关税和其他已存在的限制，跨境的境内的商品和服务数量比较起来显得还是微不足的。

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The pair are alleged to have organised shipments of Chinese garlic to Norway, which is not in the EU and not subject to its tariffs, then across the border into Sweden.

BBC: Quiz of the week's news

Countries agreed to lower their most blatant barriers to trade, such as import tariffs or quotas imposed at the border, while intervening at will, with taxes, subsidies and regulations, in their domestic economies.

ECONOMIST: At daggers drawn

Cross-border commerce, long suppressed by political rivalry, is growing, as tariffs fall and barriers to trade are dismantled.

ECONOMIST: The hopeful continent: Africa rising | The