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research article
An Option Pricing Formula for the GARCH Diffusion Model
Ravanelli, Claudia
•
Barone-Adesi, Giovanni
•
Rasmussen, Henrik
We derive analytically the first four conditional moments of the integrated variance implied by the GARCH diffusion process. From these moments we obtain an analytical closed-form approximation formula to price European options under the GARCH diffusion model. Using Monte Carlo simulations, we show that this approximation formula is accurate for a large set of reasonable parameters. Finally, we use the closed-form option pricing solution to shed light on the qualitative properties of implied volatility surfaces induced by GARCH diffusion models.
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