Analytical pricing of the smile in a forward LIBOR market model

Damiano Brigo and F. Mercurio

Quantitative Finance, 2003, vol. 3, issue 1, 15-27

Abstract: We introduce a general class of analytically tractable diffusions for modelling forward LIBOR rates under their canonical measure. The class, which is based on assuming a smooth functional dependence at expiry between a forward rate and an associated Brownian motion, is highly tractable. It implies explicit dynamics, known marginal and transition densities and explicit caplet prices at any time. As an example, we analyse the dynamics given by a linear combination of geometric Brownian motions with perfectly correlated (decorrelated) returns. We finally construct a specific model in the class that reproduces exactly the market caplet volatilities given in input. Examples of the implied-volatility curves produced by the considered models are also shown.

Date: 2003
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DOI: 10.1080/713666156

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