研討日期

2005924日上午10:10 ~ 12:00

研討地點

台大經濟系館第二教室

討論文獻

題目

作者

文獻出處

A Note on Price and Quantity Competition in Differentiated Oligopolies

Jonas Hackner

Journal of Economic Theory 93, 233_239 (2000)

報告人

陳盈秀

參加人員

黃鴻、林燕淑、梁文榮、胡均立、楊雅博、吳世傑、王光正、陳宏易、邱俊榮、吳芝文、陳更生、蔡宗秀、許淑女英、張民忠、李玫郁、高國峰李家銘、彭正浩、蔡明芳、林晏如、曾靜枝、周冰瑤、陳疆平

討論提要

In this note we show that the results developed in Singh and Vives (1984, Rand J. Econ. 15, 546_554) are sensitive to the duopoly assumption. We extend their model to allow for an arbitrary number of firms and allow only for two dimensions of firm heterogeneity, vertical product differentiation and substitutability.

論文摘要

The first proposition in Singh and Vives deals with Cournot prices are found to be higher than Bertrand prices regardless of whether goods are complements or substitutes. This means that welfare is always higher under price competition. Hackner finds when goods are substitutes prices are higher under Cournot competition than under Bertrand competition, but when goods are complements, and quality differences are large, low-quality firms charge higher prices under Bertrand competition than under Cournot competition.

Moreover, Singh and Vives deals with Cournot profits are shown to be higher than Bertrand profits when goods are substitutes. If goods are complements, the opposite relation holds. Hackner finds when goods are complements, Bertrand profits are higher than Cournot profits, but when goods are substitutes, and quality differences are small, Cournot profits are higher than Bertrand profits. If quality differences are large, high-quality firms may earn higher profits under Bertrand competition.

延伸研究

考慮消費者同時購買兩種商品,以及商品的垂直差異與替代性,討論數量與價格競爭下雙佔廠商的最適品質選擇、價格或數量,與社會福利水準。

備註