Saturday, December 8, 2018

risk neutral measure - Why discounted derivative price is a martingale?


Usually after showing that discounted stock price process is martingale under the risk-neutral measure, most authors say that this implies that the discounted derivative price process is a martingale as well. But I have difficulties to see how the former implies the latter. Generally a function of a martingale is not a martingale. Could anyone put some more light on this?




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