In quiet markets, the number of people who want to sell options increases, driving their prices, and thus the level of implied volatility, down.

在市场平静的时候，愿意出售期权的人增加，使它们的价格，也就是隐含波动性的等级下降。

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So it need not necessarily be that investors are complacent in allowing implied volatility to drift so low.

因此投资者完全不必如此自满地任由隐含波动率游离于如此低位状态。

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To put this in technical terms, the implied volatility in the option price turns out to be higher than the realised volatility.

用技术语言来说，期权价格的隐含波动性结果都要比实际波动性高。

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Options implied volatility on Hewlett-Packard earlier rose to 56.05%, but currently stands 20.05% higher on the session at 53.47% as of 1:40 pm ET.

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For those doubting Thomases who think the market is much too efficient to be affected by a few banks and funds selling options, it is worth bearing in mind that in the early 1990s one man single-handedly drove the implied volatility on Japan's Nikkei-225 average from 22% to 11% by dint of selling 34, 000 options on it.

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Options implied volatility on the Beijing-based company increased 11.2% to 47.03% as of 1:00pm in New York, with overall options volume on the stock exceeding 99, 930 contracts.

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