Unequal spatial distribution of economic activity within countries continues to be important despite the significant progress of the world economy during the second half of this century. Interest in spatial processes and inequalities has recently been revived by the influential work of Barro and...

This paper sheds light on the potential effect that Information and Communication Technologies (ICT) might generate on cities and spatial structure. The extensive theoretical discussion and speculation on how cities and geography might be affected by digital technologies, which took place before...

While interest in social determinants of individual behavior has led to a rich theoretical literature and many efforts to measure these influences, a mature "social econometrics" has yet to emerge. This chapter provides a critical overview of the identification of social interactions. We...