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Psychology, Stock/FX Trading and Option Prices

The financial crisis of 2008 had many putative causes where psychology was an important driver for human decisions. However, quantitative financial models have no “knobs” to dial psychology parameters, and so arguably cannot possibly cope with financial crises. Here we take a first step by considering how a particular aspect of psychology can influence an underlying security and subsequent option prices, in a quantitative model. We investigate how psychological regret and fear impact trading selling behavior and induces changes in underlying security prices. We then consider the resulting changes in option prices with empirical evidence.