Black-Scholes in a CEV Random Environment
File(s)Jacquier, Roome - BSCEV, Final Version.pdf (420.26 KB)
Accepted version
Author(s)
Jacquier, Antoine
Roome, Patrick
Type
Journal Article
Abstract
Classical (It\^o diffusions) stochastic volatility models are not able to capture the steepness of small-maturity implied volatility smiles. Jumps, in particular exponential L\'evy and affine models, which exhibit small-maturity exploding smiles, have historically been proposed to remedy this (see~\cite{Tank} for an overview), and more recently rough volatility models~\cite{AlosLeon, Fukasawa}. We suggest here a different route, randomising the Black-Scholes variance by a CEV-generated distribution, which allows us to modulate the rate of explosion (through the CEV exponent) of the implied volatility for small maturities. The range of rates includes behaviours similar to exponential Levy models and fractional stochastic volatility models.
Date Issued
2015-03-27
Date Acceptance
2018-02-05
Citation
Mathematics and Financial Economics
Publisher
SSRN
Journal / Book Title
Mathematics and Financial Economics
Copyright Statement
© The Authors
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/M008436/1
Publication Status
Published