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An Assignment Model of Knowledge Diffusion and Income Inequality
Randomness in individual discovery disperses productivities, whereas learning from others keeps productivities together. Long-run growth and persistent earnings inequality emerge when these two mechanisms for knowledge accumulation are combined. This paper considers an economy in which those with more useful knowledge can teach others, with competitive markets assigning students to teachers. In equilibrium, students with an ability to learn quickly are assigned to teachers with the most productive knowledge. This sorting on ability implies large differences in earnings distributions ...
Working Paper
Four Models of Knowledge Diffusion and Growth
This paper describes how long-run growth emerges in four closely related models that combine individual discovery with some form of social learning. In a large economy, there is a continuum of long-run growth rates and associated stationary distributions when it is possible to learn from individuals in the right tail of the productivity distribution. What happens in the long run depends on initial conditions. Two distinct literatures, one on reaction-diffusion equations, and another on quasi-stationary distributions suggest a unique long-run outcome when the initial productivity distribution ...
Briefing
Networks, Innovation and Productivity: A Conference Recap
How do employment targets affect firm dynamics? What is the relationship between inventor migration, and local productivity and knowledge spillovers? How are surplus gains from inventions distributed? These were among the questions addressed by economists during a recent Richmond Fed research conference.Economists from the Richmond Fed, research universities and other institutions met in Richmond for a conference in May. Researchers presented papers on a variety of topics, including digital advertising, R&D allocation, production networks, and knowledge creation and diffusion.
Briefing
Goodfriend Memorial Lecture: Knowledge Creation and Diffusion
On May 11, 2023, Hugo Hopenhayn delivered the inaugural Marvin Goodfriend Memorial Lecture with a presentation of his paper "Knowledge Creation and Diffusion with Limited Appropriation," which was co-authored with Liyan Shi. The paper highlights how intellectual property rights must trade off incentives for innovation and knowledge diffusion and considers the optimal assignment of property rights as a Ramsey problem in a dynamic model where knowledge diffusion takes place under random matching. Hopenhayn is a professor of economics at UCLA, a Guggenheim Fellow and a long-term Richmond Fed ...
Working Paper
An Assignment Model of Knowledge Diffusion and Income Inequality
Randomness in individual discovery tends to spread out productivities in a population, while learning from others keeps productivities together. In combination, these two mechanisms for knowledge accumulation give rise to long-term growth and persistent income inequality. This paper considers a world in which those with more useful knowledge can teach those with less useful knowledge, with competitive markets assigning students to teachers. In equilibrium, students who are able to learn quickly are assigned to teachers with the most productive knowledge. The long-run growth rate of this ...