Accounting for stochastic interest rates, stochastic volatility and the general dependency structure in the valuation of forward starting options

A quantitative analysis on the pricing of forward starting options under stochastic volatility and stochastic interest rates is performed. The main finding is that forward starting options not only depend on future smiles, but also directly on the evolution of the interest rates as well as the dependency structures between the underlying asset, the interest rates and the stochastic volatility: compared to vanilla options, dynamic structures such as forwardstarting options are much more sensitive to model specifications such as volatility, interest rate and correlation movements. We conclude that it is of crucial importance to take all these factors explicitly into account for a proper valuation and risk management of these securities. The performed analysis is facilitated by deriving closed-form formulas for the valuation of a forward starting options, hereby taking the stochastic volatility, stochastic interest rates as well the dependency structure between all these processes explicitlyinto account. The valuation framework is derived using a probabilistic approach, enabling a fast and efficient evaluation of the option price by Fourier inverting the forward starting characteristic functions.

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