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Implied or historical volatility to calculate theoretical options price with black scholes?

The answer by not-nick is wrong. At least for major exchanges like the CME (maybe there are some small exchanges with little option trading that use historical vol, but I would be very surprised). The ...
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What's overnight volatility?

Overnight refers to a time to maturity. In simple models that do not use fractions of days, a full day expiry is 1/365 years. In reality, FX options have a very liquid OTC market that not only trades ...
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