Entry in Monopoly Markets
基于博弈论模型构建市场集中度的实证模型，利用新车市场的垄断经销商数据，发现垄断经销商并未阻止第二家经销商进入，且进入对价格成本边际影响不大。
This paper develops new empirical models of market concentration from game-theoretic models of entry. We construct our models from inequality conditions that describe entrants' equilibrium strategies in simultaneous-move and sequential-move games, and use them to study the effects of entry in isolated monopoly markets for new automobiles. From estimates of the market size necessary to support one and two dealers, we conclude that monopoly dealers do not block the entry of a second dealer. We also find that entry does not cause price-cost margins to fall by much.