问题如下:
A stock price is currently 50. Its volatility is 20% per annum. The risk-free rate is 4% per annum with continuous compounding. Use a two-step tree to determine the value of a six-month European call option on the stock with a strike price of 48.
解释:
In this case, u = 1.1052, d = 0.9048, and p = 0.5252.
The following two-step tree shows that the value of the
option is 4.511.
这道题年期只有6个月,为什么还是需要两步法求呢?一步算出结果不精确吗