All right, so it might be that again, the problem with enforcement, although actually in 1880 America, it's not clear that they couldn't have enforced that contract.

好的,但是我刚才说了强制性的问题,虽然说那是1880年的美国,当时这种合同是否违法没有明确的界定

耶鲁公开课 - 博弈论课程节选

So, for example, in around 1900 in America or a little bit earlier, let's say 1880 in America, it really isn't clear that it was illegal to write agreements to say we'll restrict quantities.

比如1900年甚至更早的美国,假如是1880年的美国吧,在当时这种限制产量的合同是否违法,在司法上没有明确的界定

耶鲁公开课 - 博弈论课程节选

The options are a very useful technology for managing risks and I think that we'll see a rapid--Over the next few decades, we'll see rapid expansion in the scope of options contracts traded on the exchanges.

期权是管理风险的,一个非常有用的技术,我认为在往后的几十年,交易市场上,我们将会看到期权合同的迅速发展

耶鲁公开课 - 金融市场课程节选