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Original Articles

From local volatility to local Lévy models

, , &
Pages 581-588 | Received 15 Mar 2004, Accepted 19 Nov 2004, Published online: 19 Jun 2011
 

Abstract

We define the class of local Lévy processes. These are Lévy processes time changed by an inhomogeneous local speed function. The local speed function is a deterministic function of time and the level of the process itself. We show how to reverse engineer the local speed function from traded option prices of all strikes and maturities. The local Lévy processes generalize the class of local volatility models. Closed forms for local speed functions for a variety of cases are also presented. Numerical methods for recovery are also described.

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