|
...姐姐诶,你说反了。而且你的这些都是在一个假设下:Non-dividend-paying stock
It is never optimal to exercise an American call option on a non-dividend-paying stock before the expiration date.
The value the an option is divided into the time value+intrinsic value. If you exercise it, you only get the intrinsic value. And if you really want to take the money, you could sell it, and the price you get would be higher than that of exercising it.
In other words, say a call American option has a strike price of 10, and now the underlying asset is traded at 12. The value of the option will be larger than 2, which is the intrinsic value of the option. So it is never a good ideal to early exercise an non-dividend American call option.
On the other hand, it might be a good ieal to early exercise an American put option. Let me put it this way: suppose a put option has a strike price of 10, and now the underlying asset's price is 2; then you may wanna exercise it now. Because if you exercise now you would get 8, but if you wait you might get less than 8 if the price rise. If the price decrease, it could not decrease to -1! Price is always non-negative!
|