A Jump Diffusion Model with Fast Mean-Reverting Stochastic Volatility for Pricing Vulnerable Options
Nthiwa, Joy K.
Kube, Ananda O.
Omari, Cyprian O.
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Te Black–Scholes–Merton option pricing model is a classical approach that assumes that the underlying asset prices follow a normal distribution with constant volatility. However, this assumption is often violated in real-world fnancial markets, resulting in mispricing and inaccurate hedging strategies for options. Such discrepancies may result into fnancial losses for investors and other related market inefciencies. To address this issue, this study proposes a jump difusion model with fast mean-reverting stochastic volatility to capture the impact of market price jumps on vulnerable options. Te performance of the proposed model was compared under three diferent error distributions: normal, Student-t, and skewed Student-t, and under diferent market scenarios that consist of bullish, bearish, and neutral markets. In a simulation study, the results show that our model under skewed Student-t distribution performs better in pricing vulnerable options than the rest under diferent market scenarios. Our proposed model was ftted to S&P 500 Index by maximum likelihood estimation for the mean and volatility processes and Gillespie algorithm for the jump process. Te best model was selected based on AIC and BIC. Samples of the simulated values were compared with the S&P 500 values and MSE computed at various sample sizes. Values of MSE at diferent sample sizes indicate signifcant decrease to actual MSE values demonstrating that it provides the best ft for modeling vulnerable options.