Stochastic arbitrage return and its implications for option pricing

Details Stochastic arbitrage return and its implications for option pricing Stochastic arbitrage return and its implications for option pricing

2004-03-30

arxiv.org/abs/math/0403521v1

Mathematics

General Mathematics

14 pages, 3 fiqures

Scientific paper

The purpose of this work is to explore the role that 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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