This paper lays out and elaborates upon the properties of an extended Chamberlinian model with applications both in Industrial Organization and Economic Geography/Urban Economics. The framework is used to explain the impact of some major changes over the last two centuries: reductions in...

We revisit the fundamental issue of market provision of variety associated with Chamberlin, Spence, and Dixit-Stiglitz when firms sell multiple products. Both products and firms are (horizontally) differentiated. We propose a general nested demand framework where consumers first decide upon a...