Abstract
An approximation approach to Constant Maturity Swaps (CMS) pricing in the separable one-factor Gaussian LMM and HJM models is presented. The approximation used is a Taylor expansion on the swap rate as a function of a random variable which is intuitively similar to a (short) rate. This approach is different from the standard approach in CMS where the discounting is written as a function of the swap rate. The approximation is very efficient. A similar approach can be used to price CMS caps and floors.
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