網路外部性對異質雙占廠商在不同競爭模式的均衡影響分析

本文擴充Motta（1993，Journal of Industrial Economics）的模型，建立一個結合垂直產品差異性及網路外部性的模型，並藉以比較在Bertrand價格競爭與Cournot數量競爭下，廠商的最適品質選擇、市場均衡及社會福利的異同。當網路外部性夠大時，我們得到Motta（1993）一文所無法談及的結果：(1)高品質廠商的利潤在Bertrand均衡下將大於Cournot均衡下的結果；(2)低品質廠商的數量在Bertrand均衡下小於Cournot均衡下的結果；(3)生產者剩餘在Bertrand均衡下都將大於Cournot均衡下的結果。

關鍵字

網路外部性；垂直產品差異性；價格競爭；數量競爭

並列摘要

This paper compares Bertrand and Cournot equilibria in a vertically differentiated duopoly with network externalizes and attempts to provide more inference than what obtained by Motta (1993, Journal of Industrial Economics). In addition to the results of Motta (1993), if the network externality is large enough, we show that (i) the profit of high-quality firm and producer surplus under Bertrand competition are higher than that under Cournot competition; (ii) the equilibrium quantity of low-quality firm under Bertrand competition is lower than that under Cournot competition.

並列關鍵字

Network externalities ； vertical product differentiation ； Bertrand competition ； Cournot competition

參考文獻

Lambertini, Luca and Raimondello Orsini. 2001. “Network Externalities and the Overprovision of Quality by a Monopolist,” Southern Economic Journal, vol.67, pp. 969~982.

Google Scholar

Lambertini, Luca and RaimondelloOrsini. 2004. “Network Externality and the Coordination Problem,” Journal of Economics, vol. 2, pp. 123~136.

Google Scholar

Lambertini, Luca and Raimondello Orsini. 2005. “The Existence of Equilibrium in a Differentiated Duopoly with Network Externalities,” Japanese Economic Review, vol. 56, pp. 55~66.

Google Scholar

Motta, Massimo. 1993. “Endogenous Quality Choice: Price vs. Quantity Competition,” Journal of Industrial Economics, vol. 41, pp. 113~131.

Google Scholar

Navon, Ami, Shy Oz and Jacques-Francois Thisse. 1995. “Product Differentiation in the Presence of Positive and Negative Network Effects,” CEPR Discussion Paper, NO. 1306.

Google Scholar

國際替代計量

網路外部性對異質雙占廠商在不同競爭模式的均衡影響分析

全文下載

主題瀏覽