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美国经济学家在80年代初就认为中国的实际经济规模比世界银行的官方数字要大。1981年美国经济学家欧文·克拉维斯就提出以购买力来衡量中国的经济规模,不过他承认他对中国经济规模的估算要比对其他国家的经济规模的估算误差更大,因为对中国经济规模的购买力估算选用了不到100种商品的价格,而别的国家选用了300—500种。在克拉维斯研究的基础上,罗伯特·萨姆斯和艾伦·赫斯顿在1988年和1991年对中国的人均国内生产总值进行了估算。他们估算中国1990年的人均国内生产总值为2598美元,比世界银行官方数字370美元高了7倍。不过这些人的估算并没引起国际社会的很大反响。
American economists in the early 1980s believed that China’s actual economic scale was larger than the World Bank’s official figure. In 1981, American economist Irving Kravis proposed purchasing power as the measure of China’s economic scale. However, he admitted that he estimates the size of China’s economy more than the estimation of the economic scale of other countries because of the Chinese economy. The purchasing power of the scale estimates the price of less than 100 kinds of commodities, while 300-500 kinds are selected in other countries. Based on the study of Kravis, Robert Sams and Alan Heston estimated the per capita GDP of China in 1988 and 1991. They estimate that China’s per capita GDP in 1990 was US$2,598, which is seven times higher than the official World Bank’s figure of US$370. However, these people’s estimates did not cause much repercussions from the international community.