请问风险中性概率改变为什么不会影响value？

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NO.PZ201702190300000309

问题如下：

Which of Sousa’s reasons for the decrease in the value of the interest rate option is correct?

选项：

Reason 1 only

Reason 2 only

Both Reason 1 and Reason 2

解释：

A is correct.

Reason 1 is correct: A higher exercise price does lower the exercise value (payoff) at Time 2. Reason 2 is not correct because the risk-neutral probabilities are based on the paths that interest rates take, which are determined by the market and not the details of a particular option contract.

中文解析：

根据c=max{0,S_T -X}可知，当行权价越高，看涨期权的行权价值越低；且期权的行权价值与风险中性概率无关。因此只有表述1正确，选A。

之前的回答对reason 2 只解释了风险中性概率和执行价格无关，那为什么不能是执行价格和风险中性概率的改变分别影响了value呢？

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