Understanding PPPs and PPP-based National Accounts
概述了构建购买力平价的理论与实践，聚焦质量差异处理、城乡价格估计、政府服务定价等四大实操领域，并讨论修订对计量分析的影响，指出某些国际比较在理论上或实践中极为困难。
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..