(Bloomberg) -- The Chinese speculators shaking up global commodity markets are switched-on, flush with cash and probably not getting enough sleep.

For the second time this year, trading has exploded on the nation's exchanges, pushing prices of everything from zinc to coal to multi-year highs and sending authorities scrambling to deflate the bubble before it bursts. Metals brokers described panic earlier this month as the frenzy spread to markets in London and New York, prompting wild swings in prices that show no signs of abating.

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