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通过构建完全信息博弈模型,研究具有网络外部性的产品市场中,在存在消费者多方购买行为时企业的研发策略和创新动机,并深入分析多方购买者比例大小和网络外部性强度对企业研发投资水平的影响。在市场中存在多方购买行为时均衡结果表明:(i)企业有动机进行研发投资;(ii)研发企业均衡价格、需求以及利润均高于不研发企业;(iii)在差异度系数和投资系数都充分大时研发企业最优研发投入随着多方购买者比例的增加而增大。最后通过具体算例分析知道:在考虑多方购买条件下,市场中存在研发时消费者总剩余和社会总福利高于市场中不存在研发时的情形。
By building a complete information game model, this paper studies the R & D strategy and innovation motivation of the enterprises in the product market with network externality, and analyzes the R & D investment of enterprises in proportion to the proportion of multi-buyer and the intensity of network externalities Horizontal impact. Equilibrium results in the presence of multiple purchasing behaviors in the market indicate that: (i) firms have an incentive to invest in R & D; (ii) R & D firms have higher equilibrium prices, needs, and profits than non-R & D firms; (iii) Are large enough R & D enterprise optimal R & D investment increases with the proportion of multi-buyer increases. Finally, through the specific example analysis, we know that under the conditions of multi-purchase, the total surplus of consumers and the total welfare of society in research and development in the market are higher than those in the absence of R & D in the market.