要旨：We construct a model in which there are oligopolistic firms that can influence the aggregate market conditions and monopolistic firms which cannot influence the aggregate market. We assume that both types of firms can conduct R&D investments to improve their productivities. When the R&D cost of oligopolistic firms is sufficiently lower than monopolistic firms, oligopolistic firms can survive as big firms, which can manipulate the market, dominate the market and conduct the larger R&D investments. We show that with the increase in the market size, the relative outputs and R&D investments of oligopolistic firms compared to monopolistic firms are raised, and consequently, the survival of big firms becomes easy. We show that there is a subsidy policy that enables the economy to achieve the second-best allocation.

京都大学百周年時計台記念館 2階 国際交流ホールⅠ

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