density on productivity but we also consider many other local determinants supported by theory. Empirical issues are then …

production, or urbanization economies in consumption. On their own, none of these urban scale effects generate the observed …

Urbanization economies - the effects on productivity and utility created endogenously by larger cities - are a … amongst these variables depends on the nature of the dominant urbanization economy (or diseconomy). This paper looks at the …

ties) than in sparsely populated areas. We also demonstrate that, for a low urbanization level, there is a unique steady …-state equilibrium where workers do not interact with weak ties, while, for a high level of urbanization, there is a unique steady … when social interactions are optimal, we show that there is over-urbanization in equilibrium …