A Robust Test for Consumer Welfare Enhancing Mergers Among Sellers of Differentiated Products
提出一种无需假设需求函数形式的方法，通过计算合并后恢复合并前价格所需的边际成本降低，来判断合并是否提升消费者福利，为反垄断实践提供稳健工具。
Recently developed tools are used to predict the effects of differentiated products mergers, but they require the assumption of a particular functional form for industry demand and any assumption is vulnerable to attack. This paper demonstrates that marginal cost reductions necessary to restore premerger prices can be calculated without making any assumption about demand, and it provides a robust and practical method for determining whether a particular merger enhances consumer welfare. Copyright 1996 by Blackwell Publishing Ltd.