One trigger for this could be a sharp economic slowdown.

这一旦触发就可能产生一次经济急剧放缓。

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Stockmarkets around the world surged yesterday to record highs as investors increased their bets that the summer's credit squeeze would not trigger a sharp global economic slowdown.

全球股市昨日纷纷创下历史新高，原因是投资者越发认定今夏的信贷危机不会引发全球经济大规模减速。

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The US Congress's budget office last week warned that spending cuts and tax rises could trigger a sharp economic slowdown in 2013.

BBC: US economy expands more than estimated

While opinion is mixed on whether its current slowdown will end in a hard or a soft landing, China is unlikely to trigger a full-scale commodities rescue in the near future.

WSJ: The End of the Commodities Boom?