Can I read Implied Volatility in Strict Local Martingale Models on EtoBox?

Implied Volatility in Strict Local Martingale Models by Jacquier, Antoine; Keller-Ressel, Martin is a scholarly article available to read on EtoBox.

What is Implied Volatility in Strict Local Martingale Models about?

We consider implied volatilities in asset pricing models, where the discounted underlying is a strict local martingale under the pricing measure. Our main result gives an asymptotic expansion of the right wing of the implied volatility smile and shows that the strict local martingale property can be determined from this expansion. This result complements the well-known asymptotic results of Lee and Benaim-Friz, which apply only to true martingales. This also shows that `price bubbles' in the sense of strict local martingale behaviour can in principle be detected by an analysis of implied volatility. Finally we relate our results to left-wing expansions of implied volatilities in models with mass at zero by a duality method based on an absolutely continuous measure change.

Author

Jacquier, Antoine; Keller-Ressel, Martin

Published

2015

Language

EN