She was professor of economics at Yale University. 他过去曾经是耶鲁大学经济系的教授。
Every first-year economics student learns the conditions for an unregulated market, in theory, to function efficiently. 每个经济系的大一学生都会学到，在理论上，一个不受监管的市场需要哪些条件才能有效运转。
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