“Unplanned city” (and its relation “unchecked growth”) is the way many people describe cities of which they disapprove. They usually mean too little top-down planning, assuming that this is the only planning possible. But Stephen Davies, describing urbanization in England, shows that...

The authors combine measures of urban form and public transit supply for 114 urbanized areas with the 1990 Nationwide Personal Transportation Survey to address two questions: (1) How do measures of urban form, including city shape, road density, the spatial distribution of population, and...

This chapter focuses on neighborhood effects in housing markets. Households in effect choose neighborhood effects, or more generally social interactions, via their location decisions, which renders them endogenous. Across several classes of models that it examines, it emphasizes how we may...

Many sources of urban agglomeration, such as the gains from variety, better matching, and knowledge creation and diffusion, involve departures from the first-best world. Benefit evaluation of a transportation project must then take into account changes in excess burden along with any direct user...