We show how trade and communication costs interact to shape the way firms organize their activities across space. We consider the following three organizational types: (i) integrated firms in which all activities are conducted at the same location, (ii) horizontal firms, which operate several...

We develop a new model of a "featureful" city in which locations are differentiated by two attributes, that is, the distance to employment centers and the accessibility to given amenities, and we show how heterogeneous households in income are sorted out across the urban space. Under Stone-Geary...

We provide a selective survey of what has been accomplished under the heading of monopolistic competition in industrial organization and other economic fields. Among other things, we argue that monopolistic competition is a market structure in its own right, which encompasses a much broader...

We show that a wide class of demand systems for differentiated products, such as those generated by additive preferences, indirectly additive preferences, and Kimball-like homothetic preferences, can be given a multinomial logit foundation provided that the conditional indirect utility is...

We show that a market involving a handful of large-scale firms and a myriad of small-scale firms may give rise to different types of market structure, ranging from monopoly or oligopoly to monopolistic competition through new types of market structure. In particular, we find conditions under...

We propose a general model of monopolistic competition which encompasses existing models while being flexible enough to take into account new demand and competition features. Even though preferences need not be additive and/or homothetic, the market outcome is still driven by the sole variable...

Spatial economics aims to explain the location of economic activity. While the importance of the proximity to natural resources has declined considerably, distance and location have not disappeared from economic life. Recent work in spatial economics indicates that new forces, hitherto...

This paper discusses the reasons for the spatial impossibility theorem, which states that the competitive paradigm cannot explain the formation of large urban agglomerations and trade flows. This result is especially meaningful insofar as it is internal to the theory itself. We then briefly...