A Multi-Factor SABR Model for Forward Inflation Rates
19 Pages Posted: 5 Feb 2009 Last revised: 8 Apr 2010
Date Written: January 1, 2009
We introduce a new forward CPI model that is based on a multi-factor volatility structure and leads to SABR-like dynamics for forward inflation rates. Our approach is the first in the financial literature to reconcile zero-coupon and year-on-year quotes, granting, at the same time, a both fast and accurate calibration to market data. Explicit formulas for year-on-year caps/floors as well as for zero-coupon options are then derived in terms of the SABR volatility form. An example of calibration to market data is finally provided.
Keywords: Inflation, SABR dynamics, closed-form formulas, calibration
JEL Classification: C21, C63, E31, G12
Suggested Citation: Suggested Citation
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By Chris Kenyon