If the stock went up yesterday, it's more likely to go up today, than if it didn't go up yesterday.

如果股票昨天涨了，今天涨的可能性也就更大，如果昨天没涨今天也不大可能会涨。

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The "but" is that there are other ways we could model imperfect competition, and, as we're going to see today, they yield different answers.

但是"是指,通过其它方式也能获得不完全竞争模型,并且,就像我们今天会看到的,它们会产生不同的结论

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