她以每本20美元的价格出租了她的经济学和统计学课本。
She rented her economics and statistics textbooks for about $20 each.
另一项发表在《经济学与统计学评论》上的研究报告称，父母所付出的努力是十分重要的。
Another study, published in the Review of Economics and Statistics, reports that the effort put forth by parents is extremely important.
我认为人口统计学是与经济学相关的核心学科。
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