Options Arbitrage in Imperfect Markets

Option valuation models are based on an arbitrage strategy--hedging the option against the underlying asset and rebalancing continuously until expiration--that is only possible in a frictionless market. This paper simulates the impact of market imperfections and other problems with the "standard" arbitrage trade, including uncertain volatility, transaction costs, indivisibilities, and rebalancing only at discrete intervals. The author finds that, in an actual market such as that for stock index options, the standard arbitrage is exposed to such large risk and transactions costs that it can only establish very wide bounds on equilibrium options prices. This has important implications for price determination in options markets, as well as for testing of valuation models. Copyright 1989 by American Finance Association.

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