Purchasing power parities and the Dollar-A-Day approach: An unstable relationship
研究发现全球贫困测量中的每日一美元方法在应用完整一致性标准时，会产生不一致的国际贫困线，且购买力平价汇率的微小波动即可导致46.1%的不一致率，这是一个令人担忧的方法缺陷。
We show that the Dollar-A-Day methodology in global poverty measurement provides inconsistent International Poverty Line (iPL) solutions when a complete set of consistency criteria in the iPL definition is used. This article illustrates that minor fluctuations in purchasing power parity exchange rates can yield inconsistent iPLs. We find a rate of inconsistency of 46.1% and we conclude that this is a worrisome attribute of the method.