We provide an overview of the theory and practice of constructing PPPs. We focus on four practical areas: how to handle international differences in quality; the treatment of urban and rural areas of large countries; how to estimate prices for government services, health, and education; and the effects of the regional structure of the latest International Comparison Program for 2005. We discuss revisions of the Penn World Table, and their effects on econometric analysis, and include health warnings. Some international comparisons are close to impossible, even in theory, and in others, the practical difficulties make comparison exceedingly hazardous.
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机译：我们概述了构建PPP的理论和实践。我们专注于四个实践领域：如何处理质量的国际差异;大国城市和农村地区的待遇;如何估算政府服务，医疗和教育的价格;以及2005年最新国际比较计划的区域结构的影响。我们讨论了Penn World Table的修订及其对计量经济分析的影响，并包括健康警告。甚至在理论上，有些国际比较几乎是不可能的，而在另一些情况下，实际的困难使这种比较极为危险。
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