Gupta et al. (2004) shows that in a circular market under spatial Cournot discrimination, the location equilibria can be categorised into several patterns. This paper proves that, given the same number of firms producing differentiated products, one location pattern constitutes an equilibrium...

This article argues that using either the SIC or NAICS one-digit classifications as a method of aggregating two- and three-digit time series data can ignore important regional characteristics. We present a pairwise cointegration approach of aggregation where the aggregated sectors can vary...