Pricing swaps and options on quadratic variation under stochastic time change models—discrete observations case |
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Authors: | Andrey Itkin Peter Carr |
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Institution: | 1. Department of Mathematics, Hill Center for Mathematical Sciences, Rutgers, The State University of New Jersey, 110 Frelinghuysen Road, Piscataway, NJ, 08854-8019, USA 2. Bloomberg LP & NYU, 731 Lexington Avenue, New York, NY, 10022, USA
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Abstract: | We use a forward characteristic function approach to price variance and volatility swaps and options on swaps. The swaps are defined via contingent claims whose payoffs depend on the terminal level of a discretely monitored version of the quadratic variation of some observable reference process. As such a process we consider a class of Levy models with stochastic time change. Our analysis reveals a natural small parameter of the problem which allows a general asymptotic method to be developed in order to obtain a closed-form expression for the fair price of the above products. As examples, we consider the CIR clock change, general affine models of activity rates and the 3/2 power clock change, and give an analytical expression of the swap price. Comparison of the results obtained with a familiar log-contract approach is provided. |
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