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arXiv 2104.04817math.PR
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半马氏过程期权价格的极限定理

Limit theorems for prices of options written on semi-Markov processes

Enrico Scalas, Bruno Toaldo

摘要:

我们考虑标的资产服从连续时间半马尔可夫乘法过程的普通欧式期权。给出了鞅期权价格的一个公式和更新型方程。在交易时间服从Mittag-Leffler分布的情况下,在适当的标度下,我们证明了这些期权价格收敛于具有逆稳定从属子的时变几何布朗运动上的期权价格.对于时间随逆从属子变化的几何布朗运动,在从属子的拉普拉斯指数为特殊Bernstein函数的更一般情况下,我们推导出Black和Scholes方程的时间分数推广。

英文摘要:

We consider plain vanilla European options written on an underlying asset that follows a continuous time semi-Markov multiplicative process. We derive a formula and a renewal type equation for the martingale option price. In the case in which intertrade times follow the Mittag-Leffler distribution, under appropriate scaling, we prove that these option prices converge to the price of an option written on geometric Brownian motion time-changed with the inverse stable subordinator. For geometric Brownian motion time changed with an inverse subordinator, in the more general case when the subordinator's Laplace exponent is a special Bernstein function, we derive a time-fractional generalization of the equation of Black and Scholes.

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