Betsey Stevenson is a business and public policy researcher at the Wharton School of the University of Pennsylvania.

VOA: special.2010.03.04

You've got this policy tool of interest rates but once it hits zero you're out of business.

你拥有利率这一政策工具,但是一旦利率达到零点，你便失业了。

耶鲁公开课 - 金融市场课程节选