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勒纳指数被学界广泛应用于市场势力的测度,但是,其取值可能存在着悖论。为验证该悖论,本文在梳理国内外相关研究的基础上,以中国航空运输业市场势力的测度为例,以2005-2011年国内4大航空公司和行业相关数据为基础,运用假定利润最大化间接推导模型测得各公司和行业勒纳指数,并且运用直接计量方法得到Hall模型的调整模型,测得4大寡头作为一个团体的市场势力值,最后,通过比较分析验证了“勒纳指数悖论”的存在性,并尝试探究了2008年和2009年勒纳指数与“勒纳指数悖论”不合常理的情况。
Lerner index is widely used by the academic community to measure the market forces, but its value may exist paradox. In order to verify the paradox, based on the domestic and foreign researches, taking the measurement of the market power of China’s air transport industry as an example, based on the data of the four domestic airlines and industries from 2005 to 2011, Indirect derivation model was used to measure the Lerner index of each company and industry, and the direct model was used to get the adjustment model of Hall model. The 4 oligarchs were measured as the market power of a group. Finally, the comparative analysis proved that “Lerner Exponential paradox ”, and tries to explore the unreasonable situation between the Lerner Index and the“ Lerner Index Paradox ”in 2008 and 2009.