This paper analyzes the effect of innovation clusters on the adoption of a gen- eral purpose technology (GPT) and on firms R&D investment levels in im- perfect information situation. To do this, we developed a theoretical model of vertical relation, described as a four-step game between an...

We propose a new method to characterize firms' inventive activities via topological data analysis (TDA) that represents high-dimensional data in a shape graph. Applying this method to 333 major firms' patents in 1976—2005 reveals substantial heterogeneity: some firms remain undifferentiated;...

Economic analysis of telecom-related issues often takes an essentially static equilibrium perspective, using comparative statics or moment-to-moment sequences of equilibrium behavior to model the development and impacts of technologies, economic behavior and regulation. Of course, much if not...

We review the theoretical links between growth and agglomeration. Growth, in the form of innovation, can be at the origin of catastrophic spatial agglomeration in a cumulative process la Myrdal. One of the surprising features of the Krugman [Journal of Political Economy 99 (1991) 483499] model,...

Where do firms innovate? Mapping their locations and directions in technological space is challenging due to its high dimensionality. We propose a new method to characterize firms’ inventive activities via topological data analysis (TDA) that represents high-dimensional data in a shape graph....