网络外部性与规模经济性的替代关系

研究网络外部性与规模经济性共同存在的情况下市场的变化.分析了网络外部性与规模经济性的替代关系与强度、规模效应导致的市场完全覆盖以及完全覆盖后的影响力变化等问题.研究表明:(1)网络外部性与规模经济性对于市场价格和产量的确定,存在明显的替代效应,从而可以用“综合规模效应指数”来刻画两者的综合效果;(2)网络外部性与规模经济性的增强会增加消费者剩余,却可能减少企业利润;(3)“综合规模效应指数”可以唯一地确定市场的完全覆盖,另外在市场完全覆盖前后,综合规模效应对企业利润所产生的影响是不同的.

Substitution between network externality and economy of scale

This paper studies the oligopoly with the existence of both network externality and economy of scale.With a simple but meaningful model,the substitution ratio among the network externality and economy of scale is calculated in influencing market price,quantity and firms' profit.It is discovered that(1) network externality has strong substitute to the economy of scale so that the Index of Comprehensive Effect of Scale(scale of production and that of consumption,ICES) is designed to reveal their influence;(2) ICES increases the consumers' surplus but may reduce firms' profit;(3) ICES can determine the full market coverage and it has an opposite effect to firms' profit when all potential consumers purchase the good.