谷黄鸡眼侠 发表于 2013-9-13 22:33 
嘿嘿,今天才打开电脑不好意思啊。其实我知道你给的例子,只是很难理解你说的"如果大家都这么short 期权去 ...
Yes, the mechanism of the price movement satisfies the Demand and Supply model.
Theoretically, when everybody short the call, they will find that nobody want to buy them. In order to execuate the short order they have to lower the price to 10. This is generally what you said.
But a more realistic sceme is that eventually the short price is 10.01 and the long price is 9.99, and neither party has the incentive to change the price. OR, just not order is pending there.
best,