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Did Option Prices Predict the ERM Crises?

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  • Bruce Mizrach

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    (Rutgers University)

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    Abstract

    Option prices seem to behave in ways inconsistent with the Black-Scholes model. Implied volatility varies with the strike price in a parabolic shape that is often called the volatility "smile." My objective in this paper is to identify implied probability distributions that might explain this anomaly. I develop a simulated method of moments estimation procedure. I parameterize the underlying exchange rate process as a mixture of log-normals, price the options using Monte Carlo methods, and compare these simulated price "moments" to the market data. This process switching model appears to be quite promising in explaining the volatility smile. Applying this to the ERM data, I find that the probability of a devaluation in the British Pound almost doubled before it withdrew from the ERM. This risk becomes statistically significant on September 15, 1992, only one day prior to the crisis though. The French Franc crisis of July-August 1993 appears to have been better anticipated. By July 20, 1993, the model predicts with 95% confidence that the Franc is going to be devalued.

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    Bibliographic Info

    Paper provided by Rutgers University, Department of Economics in its series Departmental Working Papers with number 199610.

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    Date of creation: 01 Aug 1996
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    Handle: RePEc:rut:rutres:199610

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    Related research

    Keywords: devaluation; ERM; implied distribution; options; volatility smile;

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    Cited by:
    1. Bronka Rzepkowski, 2001. "Heterogeneous Expectations, Currency Options and the Euro / Dollar Exchange Rate," Working Papers 2001-03, CEPII research center.

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