Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This paper explores a model of innovation and spatial competition over time. A key implication of the paper is that firms' size is positively autocorrelated across time. The mechanism that generates this persistence works only in heterogenous-product markets and is based on the idea that larger firms possess better information about the design of future products. Some corroborating evidence is cited.