尼日利亚不同地区反刍动物市场定价行为研究

Pricing Conduct of Spatially Differentiated Ruminant Livestock Markets in Nigeria

本文对尼日利亚牛羊市场的空间价格一体化程度进行了检验，试图运用双变量自回归时间序列模型验证寡头垄断市场上牛羊价格的非竞争性定价行为。论文分别对牛羊市场的合谋、歧视性、价格领袖和竞争性定价行为进行了经验性检验。结论表明，在牛羊价格形成中，博尔诺（Borno）和索科托（Sokoto）州的牛羊价格领先于克里斯河（CrossRiver）、依莫（Imo）、卡诺（Kano）、拉各斯（Lagos）、尼日尔（Niger）和奥约（Oyo）州这些地方市场的价格。有关证据也支持共谋定价一般与市场的集中有关的判断。

This paper examines the extent of spatial price integration in cattle and sheep marketing in Nigeria. It attempts to verify the noncompetitive pricing behaviour in the oligopolistic cattle and sheep commodity markets using the bivariate autoregressive time-series model. Collusive, discriminatory, price leadership, competitive pricing conduct was tested empirically for both cattle and sheep. Findings show a limited, organized pricing scheme where Borno and Sokoto markets lead the other regional markets of Cross Rivers, Imo, Kano, Lagos, Niger, and Oyo in discovering cattle and sheep prices. Evidence was available to support assertions of collusive pricing commonly associated with concentrated markets.