The problem of product quality differences between countries is a difficult problem that the ICP has been unable to overcome since its establishment in 1968.From the perspective of product quality,this paper takes China and the United States of America as the research object,uses willingness to pay method to quantify the quality differences in 30 trade products and service products between the two countries,and uses the Sato-Vartia index to measure the impact of the quality differences on China's PPP and real GDP.The main results are as follows.Firstly,there is a big difference in product quality between 30 products in the two countries matched by ICP.Secondly,the overall PPP of 30 products in China after product quality adjustment is higher than the calculated results before quality adjustment,with a deviation of 9.00％and 9.02％in 2011 and 2017 respectively.Thirdly,China's GDP-level PPPs in 2011 and 2017 adjusted by the quality of 30 products are higher than the calculation results before the quality adjustment,with a deviation of 2.33％and 2.42％respectively.In addition,because ICP does not fully control the quality differences between products,China's real GDP and per capita real GDP in 2011 and 2017 are overestimated by at least 2.28％and 2.36％.On the one hand,the research of this paper adjusts the quality of China's PPP index,and tries to solve the problem of the deviation between the calculation of China's PPP and the actual economic scale,which is conducive to maintaining China's voice and economic interests in international affairs.On the other hand,developing countries and emerging countries may have the problem of PPP index underestimated by ICP,to which we provide a feasible method for quality adjustment with certain reference significance for improving the quality of global ICP measurement.
关键词
国际比较项目/中美比较/产品质量调整/支付意愿法/Sato-Vartia指数
Key words
International Comparison Program/Comparison between China and the United States of America/Product Quality Adjustment/Willingness to Pay Method/Sato-Vartia Index
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