Endogenous Bargaining Power and Declining Labor Compensation Share

Abstract

We document that the protracted decline in the labor share has been accompanied by a decline in the tightness rate defined as the number of vacancies per job seekers. We argue that these two trends are related. When vacancies and job seekers are complements in the matching process, a decline in the tightness rate reduces workers’ fundamental bargaining power as defined by Hosios (1990), which in turn reduces the labor share of income. We calibrate a search and matching model extended to allow for an endogenous determination of bargaining power. The model can rationalize the common trends in the labor shares and tightness. According to the model, workers’ bargaining power declined by about 15 percent during the 1980–2007 period.