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按照购买力平价方法估计发展中国家的经济，其经济往往会被高估。()

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When we speak of leisure nowadays, we are not thinking of securing time or opportunity to do something; time is heavy on our hands, and the problem is how to fill it. Leisure no longer signifies a space with some difficulty secured against the pressure of events: rather it is a pervasive mptiness for which we must invent occupations. Leisure is a vacuum, a desperate state of vacancy a vacancy of mind and body. It has been commandeered by the sociologists and the psychologists: it is a problem.

1994年乌拉圭贸易回合达成协议，在2005年之后取消航空行业的进口配额。()

关税不具有国际收支效应。()

亚当·斯密和李嘉图的贸易理论都是通过对具体实践的考察总结出来的。()