Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In a search and matching model where workers are ex ante heterogeneous with respect to productivity and there is labor force participation, Albrecht et al. (2010) show that satisfying the Hosios rule leads to excessive vacancy creation. We show that efficient vacancy creation requires a modified version of the Hosios condition that captures not only the standard search externalities but also the output externality and the participation externality.