Due to the officialgross domestic productgrowth rateThe calculation of is from different base years.For example, the price in 1980 is used as the base year price for calculating the growth rate in the period from 1981 to 1990, and the price in 1990 is used as the base year after 1991.Because of twoDevelopment stageThe average growth rate of this period will decrease due to the interaction between.If consistent 1990 base year prices are usedRecalculate, 1985-1993Annual average growth rateFrom the official 9.7% to 9.4%.The official GDP is also inaccurate（Hu Yongtai，1998）。Therefore, Hu Yongtai believes that the estimation method of average GDP growth rate and average TFP growth rate is inferior to the estimation method of their respective possible ranges, which includes the real situation.That is to determine the upper or lower limit of the possible range of GDP growth rate and TFP growth rate, so that the real GDP and TFP are in this region.GDP growthCeilingEstimated valueProvided by official data (calculated in consistent base year)MinimumIt is calculated from the industrial output value after being deflated by the ex factory price index.[1]
