A Simple Method for Bounding the Elasticity of Growing Demand with Applications to the Analysis of Historic Antitrust Cases
提出仅需少量数据即可对增长的同质产品市场需求弹性进行边界估计的简单方法，并应用于1952年杜邦案和1911年美国烟草公司拆分案，评估反垄断补救措施的有效性。
We propose a simple method, requiring only minimal data, for bounding demand elasticities in growing, homogeneous-product markets. Since growing demand curves cannot cross, shifts in market equilibrium over time can be used to “funnel” the demand curve into a narrow region, bounding its slope. Our featured application assesses the antitrust remedy in the 1952 DuPont decision, ordering incumbents to license patents for commercial plastics. We bound the demand elasticity significantly below 1 in many post-remedy years, inconsistent with monopoly, supporting the remedy’s effectiveness. A second application investigates whether the 1911 dissolution of American Tobacco fostered competition in the cigarette market.