Import curbs have long been protectionists’ weapon of choice. But export restrictions are a growing problem. On Tuesday, in the first case of its kind, the World Trade Organisation backed a complaint against China’s use of quotas and duties to limit exports. The case related to curbs on exports of raw materials such as zinc and coke. But it sets a precedent which should also apply to rare earths – minerals used in making high-tech goods from mobile phones to smart bombs, and 97 per cent of which are mined in China. This is good news.
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