Who Deters Entry? Evidence on the Use of Strategic Entry Deterrents
研究企业如何通过广告建立产品忠诚、广泛申请专利抢占市场等策略来阻止新竞争者进入，发现市场集中度高、大企业多、研发密集时更常用这些策略，且已有其他壁垒时使用较少。
To deter entry into new product markets, firms most often use the creation of product loyalty through advertising and the preemption of markets through numerous and broad patents. Filling all product niches, making the results for highly profitable division, and advertising are used most frequently for existing products. For newly developed products, strategic entry deterrents are used more often when markets are concentrated, populated by large firms, and research intensive. Strategic entry deterrents for existing products are used in concentrated, research intensive markets, but firm size has no effect. Firms develop strategies to deter entry less when other barriers exist. Copyright 1992 by MIT Press.