A communist leadership always on full alert for violations of national sovereignty has lately grown shrill over calls by American and European policymakers to raise the value of the Chinese yuan, kept low by a heavily managed currency regime. Recently the prime minister, Wen Jiabao, presided over a grumpy summit between China and the European Union. There he berated his guests for their "unfair" pressure to revalue the yuan. The mantra of Mr Wen and other Chinese leaders is that the yuan ain't nobody's business but their own.
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