This paper presents a new framework for modeling the fine microstructure of knowledge creation dynamics. Our focus is on the creation of working nowledge used in innovation, for example, the knowledge used by a researcher in the economics profession. The framework has been developed to address...

Zipf's law is one of the best-known empirical regularities of the city-size distribution. There is extensive research on the subject, where each city is treated symmetrically in terms of the cost of transactions with other cities. Recent developments in network theory facilitate the examination...

This paper demonstrates that a pollution tax with a fixed cost component may lead, by itself, to segregation between clean and dirty firms without heterogeneous preferences or increasing returns. We construct a simple model with two locations and two industries (clean and dirty) where pollution...