Abstract

http://ssrn.com/abstract=1895474
 
 

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Quantos and FX Skew


Julien Pantz


Bank of America Merrill Lynch

August 1, 2011


Abstract:     
We study the impact of the FX skew on quanto convexity adjustments. Using a double shifted lognormal model allows an easy calibration to the skews as well as expressing the FX skew impact analytically for quanto forwards. We conclude that under non stressed market conditions (σ^2 T≪1) the impact is negligible for short maturities and still not material for longer maturities compared to correlation risk. However, under stressed market conditions or if quanto products become liquid enough to provide market implied correlation, we would switch from a mark-to-model with uncertain correlation to a mark-to-market with implied correlation. In this situation we will need to incorporate the FX skew. In a second study, we emphasis the drawbacks of modelling FX with shifted-lognormals and as an alternative we introduce the double mixture of lognormals model as the easiest model compatible with the flat lognormal quanto adjustment formula.

Number of Pages in PDF File: 20

Keywords: quanto, double shifted-lognormal model, FX skew, convexity adjustments, correlation uncertainty, double mixture of lognormals

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Date posted: July 27, 2011 ; Last revised: August 8, 2011

Suggested Citation

Pantz, Julien, Quantos and FX Skew (August 1, 2011). Available at SSRN: http://ssrn.com/abstract=1895474 or http://dx.doi.org/10.2139/ssrn.1895474

Contact Information

Julien Pantz (Contact Author)
Bank of America Merrill Lynch ( email )
2 King Edward Street
London, EC1A 1HQ
United Kingdom
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