Regional economics: A new economic geography perspective

We show that the concepts and tools developed in new economic geography may be used to revisit several problems in regional economics. In particular, we want to stress the following two points: (i) what do we mean by a region and (ii) what kind of interactions between regions do we want to study and how to model them? We conclude by discussing a few open problems that should be explored in more detail for regional economics to become a richer body of knowledge.