Volatility smile and stochastic arbitrage returns

Details Volatility smile and stochastic arbitrage returns Volatility smile and stochastic arbitrage returns

2004-05-27

arxiv.org/abs/cond-mat/0405646v1

Physics

Condensed Matter

Other Condensed Matter

15 pages, 3 figures. The paper was accepted for publication in Physica A

Scientific paper

The purpose of this work is to explore the role that random arbitrage opportunities play in pricing financial derivatives. We use a non-equilibrium model to set up a stochastic portfolio, and for the random arbitrage return, we choose a stationary ergodic random process rapidly varying in time. We exploit the fact that option price and random arbitrage returns change on different time scales which allows us to develop an asymptotic pricing theory involving the central limit theorem for random processes. We restrict ourselves to finding pricing bands for options rather than exact prices. The resulting pricing bands are shown to be independent of the detailed statistical characteristics of the arbitrage return. We find that the volatility ``smile'' can also be explained in terms of random arbitrage opportunities.

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