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目前,以价格指数“对数差分”计算市场分割度的“价格法”被广泛采用。本文认为,在当前市场统一度已经明显提高的情况下,这一做法有可能产生偏误,应当从计算原理和数据来源两方面对现有的衡量方法进行改进,并对多种测度方法得到的结果加以比较印证。基于“生产法”的思想,对产业结构与需求结构进行分析比较,能够更加准确地反映要素配置的效率情况(可称为“产需法”);根据“价格法”的原理,应采用包含地区间价差信息的实际价格数据,而非价格指数来计算市场分割度。改进后的计算方法得出了彼此一致,但不同于现有做法的结果:国内市场分割程度在2006年以后有重新加剧的趋势,并主要体现在华中、华北、西南三大地区。
At present, the “price law” that uses the price index “logarithmic difference ” to calculate market segmentation degree is widely used. This paper argues that in the current market unification has significantly improved the case, this approach may be biased, should be calculated from the principles and sources of data to improve the existing measurement methods, and a variety of measurement methods to obtain The results to be confirmed. Based on the idea of “Production Law ”, the analysis and comparison of industrial structure and demand structure can more accurately reflect the efficiency of factor allocation (which may be referred to as “production and demand law”); according to the “Price Law” , The actual price data containing the inter-region spread information should be used instead of the price index to calculate the market segmentation degree. The improved calculation method is consistent with each other, but different from the result of the existing practice: the degree of domestic market segmentation has been re-intensified after 2006 and is mainly reflected in the three major regions of Central China, North China and Southwest China.