中国烟草加工业市场力量再估测

Re-measurement of Market Power in Chinese Tobacco Processing Industry

目前国内关于市场力量估测的研究以使用NEIO模型为主,其主要缺陷在于只能估测卖方市场力量,且精确性不足。本文所采用和修正的原始—对偶索洛余值法,一方面可同时估测买方和卖方市场力量,另一方面所使用的数据可获得性强,估测结果也较精确。通过对我国烟草加工业1985～2007年的时间序列数据进行实证研究发现,我国烟草加工业在上游烟叶收购环节具有很强的买方市场力量,在下游卷烟销售环节也具有较强的卖方市场力量,但买方市场力量更强。同时,以上两个环节的市场力量都呈现出明显增强的趋势,两者相比,买方市场力量的增幅更大。

Nowadays,although NEIO model is employed widely on estimating market power in China,it can only measure monopolistic market power and lacks accuracy.The Primal-Dual approach we use and amend in this study is better than before,on the one hand,it can measure market power in both output and input markets,on the other hand,it is easy to ellect the datasets and to get more accurate results.We use the time series data（1985—2007） to estimate the market power of Chinese cigarette manufacturers and find that although there are strong market power both in the upstream and downstream,the upstream monopsonistic market power is stronger.Meanwhile,we also find that the market power of these two aspects enhances significantly year after year,and the increase proportion of monopsonistic market power is much bigger.