Persistence of Leadership in Product Innovation
研究了垂直产品差异化模型中企业市场结构的三种均衡模式，通过引入“干中学”解释了产品创新序列中市场份额模式的稳定性。
In a firm model of vertical product differentiation, three distinct patterns of market shares emerge as an equilibrium outcome, reflecting three distinct strategies in respect of timing of the introduction of new products. The main novelty, relative to the existing literature on vertical product differentiation, lies in the incorporation of "learning by doing." This assumption generates stability of market share patterns over a sequence of product innovations. Copyright 1992 by Blackwell Publishing Ltd.