After all, I'm going to try and build a simulation of the stock market, so I might as well have the notion of a market, and probably the notion of a stock.

不管怎样,我得建立一个股票市场的仿真程序，所以我最好要有股票的概念，和股市的概念。

麻省理工公开课 - 计算机科学及编程导论课程节选