以下是引用cfalevel2can在2011-6-8 16:26:00的发言: 什么option maturity越长,value越低,european call, european put, american call。我选了european put
you are right. reason is that you need to calculate european put's present value given it could only be exercised until maturity.
This is not the case for American options which could be exercised at any time