This paper develops an innovation model where firms choose which research paths to follow. Contrary to most of the literature which focuses only on the level of investment in innovation, this model captures both the variety of research paths undertaken and the amount of duplication of research....

This paper develops a three-stage model of innovation, fixed-fee licensing and production to evaluate the welfare effects of compulsory licensing, taking into account both static (information sharing) and dynamic (innovation incentive) effects. Compulsory licensing is shown to have an...

This paper complements research on how {\em love of wealth} bears on key variables in a Ramsey-Cass-Koopmans growth framework. It is shown that for an optimum the social planner cannot have an excessive {\em love of wealth}. If the planner has the `right' {\em love of wealth} an optimum exists...

This paper provides the exact analytical solution for the standard model of endogenous growth when consumers have present-biased preferences and make time-inconsistent savings plans, which they revise continuously. It is shown that long-run growth is not necessarily lower under present-biased...

This paper analyzes within a two-region endogenous growth model how different types of public policies affect the equilibrium spatial distribution of economic activity. Integration is modeled as a continuum and enables firms to access the public input of the respective other region. Given a...

This paper develops a two-sector R&D-based growth model with congestion effects from increasing urban population density. We show that endogenous technologicalprogress causes structural change if there are positive productivity spillovers from the modern to the traditional sector and Engel’s...

The output multiplier turns negative before a deficit spending program expires. We show the generality of this unpleasant finding for the standard real business cycle model. We then calibrate an extended model for the US and demonstrate how fiscal stimulus slows down economic recovery from...

This paper studies product obsolescence, the entry and exit of firms, and the evolution of firm size as foundation of endogenous economic growth. I develop a dynamic general equilibrium model with heterogenous firms to analyze firm behavior in an economic environment that is characterized by a...

Since 1991, survey expectations of long-run output growth for the U.S. relative to the rest of the world exhibit a pattern strikingly similar to that of the U.S. current account, and thus also to global imbalances. We show that this finding can to a large extent be rationalized in a two-region...

Recent studies focused on testing the Easterlin hypothesis (happiness and national income correlate in the cross-section but not over time) on a global level. We make a case for testing the Easterlin hypothesis at the country level where individual panel data allow exploiting important...