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英文文献：Dynamic Assessment of Oligopoly, Oligopsony Power, and Cost Efficiency using the New Empirical Industrial Organization in the U.S. Beef Packing Industry-利用新的实证产业组织对美国牛肉包装产业的寡头垄断、寡头权力和成本效率进行动态评估
英文文献作者：Ji, In Bae,Chung, Chanjin
英文文献摘要：
In this paper, the new empirical industrial organization approach with a dynamic model is simultaneously employed to measure the degree of oligopoly, oligopsony power, and cost efficiency in the U.S. beef packing industry. The oligopsony power is estimated with two effects: cash cattle procurement market power and captive supply market power. The model is estimated by the Generalized Method of Moments using monthly data from 1990 to 2006. The empirical results reveal the presence of market power in both the beef retail market and the cattle procurement market in the sample period. The captive supply is a source of oligopsony market power, but the effect is considerably small. The oligopsony market power is greater and less stable than oligopoly market power for the whole sample period. The cost efficiency effect outweighs the market power effects for the sample period.
本文同时采用带有动态模型的新实证产业组织方法来衡量美国牛肉包装产业的寡头垄断程度、寡头权力和成本效率。从现金牛采购市场力和垄断供应市场力两方面对寡头垄断力进行了估计。该模型是利用1990年至2006年的月数据，用广义矩法估计的。实证结果表明，在样本期内，牛肉零售市场和肉牛采购市场均存在市场力。垄断供应是寡头市场力量的一个来源，但其影响相当小。在整个样本期内，寡头垄断市场力比寡头垄断市场力更大且更不稳定。在样本期内，成本效率效应大于市场力量效应。
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