Abstract
This paper studies modeling and existence issues for market models of option prices in a continuous-time framework with one stock, one bond and a family of European call options for one fixed maturity and all strikes. After arguing that (classical) implied volatilities are ill-suited for constructing such models, we introduce the new concepts of local implied volatilities and price level. We show that these new quantities provide a natural and simple parametrization of all option price models satisfying the natural static arbitrage bounds across strikes. We next characterize absence of dynamic arbitrage for such models in terms of drift restrictions on the model coefficients. For the resulting infinite system of SDEs for the price level and all local implied volatilities, we then study the question of solvability and provide sufficient conditions for existence and uniqueness of a solution. We give explicit examples of volatility coefficients satisfying the required assumptions, and hence of arbitrage-free multi-strike market models of option prices.
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Schweizer, M., Wissel, J. Arbitrage-free market models for option prices: the multi-strike case. Finance Stoch 12, 469–505 (2008). https://doi.org/10.1007/s00780-008-0068-6
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DOI: https://doi.org/10.1007/s00780-008-0068-6
Keywords
- Option prices
- Market model
- Implied volatility
- Static arbitrage
- Dynamic arbitrage
- Drift restrictions
- Existence result