Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This article derives sharp bounds on labor supply and demand shift variables within a nonparametric simultaneous equations model using only observations of the intersection of upward sloping supply curves and downward sloping demand curves. Furthermore, I demonstrate that these bounds tighten with the imposition of plausible assumptions on the distribution of the disturbance terms. Using Katz and Murphy's (1992) panel data on wages and labor inputs, I estimate these bounds and assess the supply and demand factors that determine changes within male--female wage differentials and the college wage premium.