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James Owen Weatherall
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preprint description
The Black-Scholes(-Merton) model of options pricing establishes a theoretical relationship between the "fair" price of an option and other parameters characterizing the option and prevailing market conditions. Here I discuss a common application of the model with the following striking feature: the (expected) output of analysis apparently contradicts one of the core assumptions of the model on which the analysis is based. I will present several attitudes one might take towards this situation, and argue that it reveals ways in which a "broken" model can nonetheless provide useful (and tradeable) information.

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