Worker Bargaining Power and Market Tightness: Theory and Evidence
What determines worker bargaining power? This paper argues that bargaining power is an equilibrium outcome of labour market conditions: when alternative employers are easier to find, a worker’s threat to walk away from a negotiation becomes credible, and the worker’s bargaining power rises. I formalise this in a non-cooperative bargaining model in which workers and firms keep searching while they negotiate. In equilibrium, bargaining power is strictly increasing in labour market tightness. The model delivers an empirical counterpart: bargaining power is the pass-through of firm productivity into wages, which should therefore rise with tightness. Using French matched employer-employee data and measures of local labour market tightness, I find that a one euro increase in the hourly marginal product of labour raises the hourly wage by 5.2 cents at average tightness and by 7.1 cents one standard deviation above it, a 37% increase in pass-through.
Presented at: SAEe 2026 (Las Palmas de Gran Canaria), EWMES 2026 (Warsaw), Fourth Women in Central Banking Workshop (Mexico City), 41st AIEL Conference (Rome), EALE 2026 (Barcelona), EAYE 2026 (Bilbao)