要旨：I propose a model with multiple cities that allows inter-city interactions through costly trade, internal migrations, and firm relocation. The model features multiple sectors, heterogeneous firms, and heterogeneous workers. The comparative statics of the model focuses on three shocks: falling transport costs, declining education costs, and increasing high-skill intensities. I show that: (1) there is a non-monotonic relationship between transport costs and the spatial income inequality; (2) a structural transformation triggered by declining education costs reduces the inequality, (3) the one due to a skill-biased technological change, however, predicts the opposite. The theoretical predictions are confirmed by a panel regression using the data from 32 countries with 1,962 regions.

要旨：This paper shows evidence for a microeconomic mechanism of collaborative knowledge creation proposed by Berliant and Fujita (2008) using the panel data of patent development in Japan. Researchers communicate via common knowledge, and innovate by utilizing differentiated knowledge of each other. A longer duration of collaboration between a pair of researchers increases their common knowledge which at the same time accumulates differentiated knowledge between them and the rest of the researchers. Facing polyadic interactions, individual researchers collectively determine the set of collaborators to interact, and hence the fraction of time a researcher spends with each of her collaborators, so as to optimize the composition of common and differentiated knowledge between a given researcher and each of her collaborators. We also show additional evidence for creative destruction, positive influence of local spillovers as well as transport accessibility.

拠点プロジェクト「長期的なパートナーシップについての実験経済学」と共催

AY2017
Program