It turns out that in financial markets "black swans", or extreme events, occur much more often than the usual probability models suggest.

目前看来，金融市场的“黑天鹅”或者说一些极端事件所发生的频率，比通常的概率模型所预测的要大得多。

youdao

The oldest Oxford racket had been elbowed out by the black markets in Woodbines, toffees, tomatoes.

最古老的牛津非法交易市场被推出去了，太妃糖和西红柿被黑市挤出去了。

youdao

If you lined up the 1.5tn pound coins that were reported to have been wiped off the global markets on one single black Friday, they would get you from here to Mars.

据说在某个黑色星期五全球金融市场就损失了1.5万亿英镑，如果将价值1.5万亿英镑的一英镑硬币连成一线，那可以从地球这旮沓连到火星那旮沓了。

youdao

Crime is on the rise too, and where there are black markets, mafia-type protection rackets probably follow.

ECONOMIST: The state the North Korean regime is in

In fact they are more of a problem than the liberals, because when occasionally they are in power, they spout disconnected free-market slogans while they spend us into oblivion and practice crony capitalism, giving free-markets an undeserved black eye.

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But as a dossier of evidence on nuclear black markets published this week by the London-based International Institute for Strategic Studies points out, Mr Khan's business model wasn't unique.

ECONOMIST: The nuclear black market