Externalités de réseaux vs. externalités informationnelles dans les dynamiques de localisation

The aim of the paper is to discuss the new sequential and cumulative approaches of location process based on non-market interactions. We distinguish between the role played by network externalities and the one played by information externalities in order to distinguish locational clusters and locational cascade which respectively explain the Silicon Valley and the Silicon Sentier emergence. We conclude on the necessity to extend the topic to the stability properties of these two kinds of agglomeration structures. Classification JEL : D83, L63, L86, R11, R12.<np pagenum="536"/>