In regular short-selling,traders borrow assets and sell them at a set price, hoping they can make a profit by buying them later at a lower price.

VOA: standard.2010.05.19

When they look at the price of a company, how do we know whether the price at which you're buying is reasonable?

当他们看到公司股价的时候,怎么知道买入的价格是合理的呢

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Buying them tends to push up the price; that tends to influence the yield down so it encourages a lower level of interest rate.

买进它们，导致价格上升；,导致参数降低,所以它鼓励一个低的利率水平。

耶鲁公开课 - 金融市场课程节选