The British Russian option

Publisher:
Taylor and Francis
Publication Type:
Journal Article
Citation:
Stochastics. An International Journal of Probability and Stochastic Processes, 2011, 83 (4-6), pp. 315 - 332
Issue Date:
2011-01
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Following the economic rationale of the British put and call option, we present a new class of lookback options (by first studying the canonical 'Russian' variant) where the holder enjoys the early exercise feature of American options, whereupon his payoff (deliverable immediately) is the 'best prediction' of the European payoff under the hypothesis that the true drift of the stock price equals a contract drift. Inherent in this is a protection feature which is key to the British Russian option. Should the option holder believe the true drift of the stock price to be unfavourable (based upon the observed price movements) he can substitute the true drift with the contract drift and minimize his losses. The practical implications of this protection feature are most remarkable as not only is the option holder afforded a unique protection against unfavourable stock price movements (covering the ability to sell in a liquid option market completely endogenously), but also when the stock price movements are favourable he will generally receive high returns. We derive a closed-form expression for the arbitrage-free price in terms of the rational exercise boundary and show that the rational exercise boundary itself can be characterized as the unique solution to a nonlinear integral equation. Using these results, we perform a financial analysis of the British Russian option that leads to the conclusions above and shows that with the contract drift properly selected, the British Russian option becomes a very attractive alternative to the classic European/American Russian option.
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