This thesis discloses that in an open economy,comparing prices of the same commodities in different countries or monetary zones share such characteristics as the tendency of being similar,identical in technology,and the measure not using monetary.Thus it establishes a brand-new international comparison model based on these characteristics,which is different from the models of exchange rate and purchasing power parity.In this model,with randomly selected bench goods,total products of all comparing countries can be converted into physical quantity of total products of the general comparing characteristics in international,and at the same time,a series of comparing price system with international mean value can be produced.Under the condition of randomly selected bench currency,comparing total products and currency exchange rate of each selected countries may also be produced.This article gives a demonstration of comparing price system,and in the mean time compares this model with the model of purchasing power parity.
