我想 第二章說的 是基本的  purchasing a put option only...... the put option buyer can walk away if the market price of the underlying asset > the strike price (but of course lose all of the premium he had already paid)

BUT IN CHAPTER 3........IT SAYS，PURCHASING A PUT OPTION WITH A LONG POSITION，that means you buy the asset for $1000，and purchase a 1000，6months strike put  for YOUR ASSET to protect decrease in value，so the FV of cost incurred is (1000+74.201) x 1.02.  And if the spot price after 6months is 1000... then you lose -95.68

2# p213366548

第二章的情况是time=0时候，option buyer only has to pay premium,但是第三章里，put option buyer付出的是1000+premium. 这样理解对吗？

對的 因為第二章說的 只是 buy the put only  但是 第三章說的是  buy the put AND the underlying asset that gives you A FLOOR

明白了~~ 谢谢楼上！！