Oligopoly Power in the Food and Tobacco Industries
利用新实证产业组织框架和四位SIC数据，估计并检验了40个食品和烟草行业的寡头垄断势力程度与规模经济，发现除三个行业外均存在显著的寡头垄断势力，且超过82%的行业呈现非恒定规模报酬。
Abstract In this article we estimate and test for the degree of oligopoly power and economies of scale in forty food and tobacco industries using the New Empirical Industrial Organization (NEIO) framework and four‐digit SIC data. Lerner indices and elasticities of scale are compared throughout the entire food and tobacco industries. T‐tests verify that all but three of these industries exert statistically significant degrees of oligopoly power and that over 82% of these industries exhibit nonconstant returns to scale. The empirical results also provide estimates of the price elasticities of demand for each industry.