One is the mega-chain Wal-Mart. "On one hand,Wal-Mart's whole business model is based on consumption.

VOA: standard.2010.01.23

Now we need to think about a model of the stock market And the model we're going to use is based on what's called the Efficient Market Hypothesis.

现在需要想一想一个股市的模型是怎样的,我们要用的模型是,基于有效率市场假说的。

麻省理工公开课 - 计算机科学及编程导论课程节选