Free entry, market diffusion, and social inefficiency with endogenously growing demand

Hiroshi Kitamura, Akira Miyaoka, Misato Sato

Research output: Contribution to journalArticle


This paper analyzes market diffusion in the presence of oligopolistic interaction among firms. Market demand is positively related to past market size because of consumer learning, networks, and bandwagon effects. Firms enter the market freely in each period with fixed costs and compete in quantities. We demonstrate that the nature of the inefficiency under free entry can change as the market grows, and more importantly, that S-shaped diffusion can be a signal that the number of firms under free entry is initially insufficient, but eventually excessive.

Original languageEnglish
Pages (from-to)98-116
Number of pages19
JournalJournal of the Japanese and International Economies
Publication statusPublished - Sep 1 2013
Externally publishedYes



  • Free entry
  • Intertemporal externalities
  • Market diffusion
  • Oligopolistic interaction
  • S-shaped diffusion

ASJC Scopus subject areas

  • Finance
  • Economics and Econometrics
  • Political Science and International Relations

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