关键词: 可加性, 特征性, 汇总方法, 替代偏差

Abstract: In international economic comparison, additivity and characteristicity are two important properties that purchasing power parities aggregation methods should have, but all the methods that ICP used before don’t conform to these two properties. According to the definition of characteristicity, this paper references the way that the GEKS method approximates the Fisher index to satisfy characteristicity, and finally based on the viewpoint that using a nonlinear optimization process to approximate the Fisher index to build a PPP aggregation method（named MBC method）which has maximized characteristicity. An empirical example shows that the MBC method is better than the current 8 aggregation methods that satisfy additivity in decreasing the substitution biases. The MBC method combines the merits of the characteristicity property that the GEKS method possesses and the additivity property that the GK method possesses, and also can decrease substitution biases. Therefore, the MBC method can change the situation that we should choose different aggregation method when the purpose of using PPP changes.

Key words: Additivity, Characteristicity, Aggregation Method, Substitution Biases