A new approach for option pricing under stochastic volatility

Peter Carr, Jian Sun

Research output: Contribution to journalArticle

Abstract

We develop a new approach for pricing European-style contingent claims written on the time T spot price of an underlying asset whose volatility is stochastic. Like most of the stochastic volatility literature, we assume continuous dynamics for the price of the underlying asset. In contrast to most of the stochastic volatility literature, we do not directly model the dynamics of the instantaneous volatility. Instead, taking advantage of the recent rise of the variance swap market, we directly assume continuous dynamics for the time T variance swap rate. The initial value of this variance swap rate can either be directly observed, or inferred from option prices. We make no assumption concerning the real world drift of this process. We assume that the ratio of the volatility of the variance swap rate to the instantaneous volatility of the underlying asset just depends on the variance swap rate and on the variance swap maturity. Since this ratio is assumed to be independent of calendar time, we term this key assumption the stationary volatility ratio hypothesis (SVRH). The instantaneous volatility of the futures follows an unspecified stochastic process, so both the underlying futures price and the variance swap rate have unspecified stochastic volatility. Despite this, we show that the payoff to a path-independent contingent claim can be perfectly replicated by dynamic trading in futures contracts and variance swaps of the same maturity. As a result, the contingent claim is uniquely valued relative to its underlying's futures price and the assumed observable variance swap rate. In contrast to standard models of stochastic volatility, our approach does not require specifying the market price of volatility risk or observing the initial level of instantaneous volatility. As a consequence of our SVRH, the partial differential equation (PDE) governing the arbitrage-free value of the contingent claim just depends on two state variables rather than the usual three. We then focus on the consistency of our SVRH with the standard assumption that the risk-neutral process for the instantaneous variance is a diffusion whose coefficients are independent of the variance swap maturity. We show that the combination of this maturity independent diffusion hypothesis (MIDH) and our SVRH implies a very special form of the risk-neutral diffusion process for the instantaneous variance. Fortunately, this process is tractable, well-behaved, and enjoys empirical support. Finally, we show that our model can also be used to robustly price and hedge volatility derivatives.

Original languageEnglish (US)
Pages (from-to)87-150
Number of pages64
JournalReview of Derivatives Research
Volume10
Issue number2
DOIs
StatePublished - May 2007

Fingerprint

Option pricing
Stochastic volatility
Variance swap
Contingent claims
Maturity
Assets
Futures prices
Futures contracts
Spot price
Diffusion process
Pricing
Partial differential equations
Calendar
Hedge
Stochastic processes
State variable
Volatility risk
Derivatives
Arbitrage
Option prices

Keywords

  • Option pricing
  • Stochastic volatility

ASJC Scopus subject areas

  • Economics, Econometrics and Finance(all)

Cite this

A new approach for option pricing under stochastic volatility. / Carr, Peter; Sun, Jian.

In: Review of Derivatives Research, Vol. 10, No. 2, 05.2007, p. 87-150.

Research output: Contribution to journalArticle

Carr, Peter ; Sun, Jian. / A new approach for option pricing under stochastic volatility. In: Review of Derivatives Research. 2007 ; Vol. 10, No. 2. pp. 87-150.
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