On the Effects of Entry in Cournot Markets
在对称古诺寡头垄断框架下，用格论方法给出两组最小假设，分别推导出企业数量增加时行业价格和单个企业产出的变化方向，以及企业利润的下降趋势，结论清晰且易于解释。
In the framework of symmetric Cournot oligopoly, this paper provides two minimal sets of assumptions on the demand and cost functions that imply respectively that, as the number of firms increases, the minimal and maximal equilibria lead to (i) decreasing industry price and increasing or decreasing per-firm output; and (ii) increasing industry price (and decreasing per firm output.) In both cases, per-firm profits are decreasing. The analysis relies crucially on lattice-theoretic methods and yields general, unambiguous and easily interpretable conclusions of a global nature. As a byproduct of independent interest, new insight into the existence of Cournot equilibrium is developed.