Volatility Skew

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Dictionary Says

Definition of 'Volatility Skew'

The difference in implied volatility (IV) between out-of-the-money, at-the-money and in-the-money options. Volatility skew, which is affected by sentiment and the supply/demand relationship, provides information on whether fund managers prefer to write calls or puts.

Also known as "vertical skew".
  
Volatility Skew
Investopedia Says

Investopedia explains 'Volatility Skew'

A situation where at-the-money options have lower IVs than out-of-the-money options is sometimes referred to as a volatility "smile", due to the shape it creates on a chart (as above). In markets such as the equity markets, a skew occurs because money managers usually prefer to write calls over puts.

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'Volatility Skew'

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