Correcting for variations in the cost of living across countries, the paper concludes that $10,750 of purchasing power in the year 1990 is the threshold for per capita income beyond which a country is high income, while $7,250 makes it upper-middle income. (These thresholds may sound low, but the World Bank uses similar cutoffs.)
在修正了不同国家生活成本的差异后，该文章指出，1990年10,750美元购买力为迈入高收入行列国家的人均收入门槛，而中上收入门槛则为7,250美元。（这些阈值也许听上去很低，但世界银行也使用类似的标准。）