Preferences, entry, and market structure
统一分析了偏好对称且商品种类内生时的不完全竞争模型，发现加成率取决于替代弹性和品种数，并考察了自由进入均衡的比较静态，为收入、市场规模和生产率对加成率的影响提供了条件。
We provide a unified approach to imperfect (monopolistic, Bertrand, and Cournot) competition when preferences are symmetric over a finite but endogenous number of goods. Markups depend on the Morishima elasticity of substitution and on the number of varieties. The comparative statics of free‐entry equilibria is examined, establishing the conditions for markup neutrality with respect to income, market size, and productivity. We compare endogenous and optimal market structures for several non‐CES examples. With a generalized linear direct utility, the markup can be constant and optimal under monopolistic competition, and nonmonotonic in the number of firms under Bertrand or Cournot competition.