Bargaining Power and Market Tightness: A Microfoundation for Generalised Nash Bargaining
This paper develops a non-cooperative microfoundation for generalised Nash bargaining weights in frictional matching markets. I study an alternating-offers wage bargaining game in which agents can continue searching while negotiating and endogenously decide whether to abandon an ongoing bargain when a new partner arrives. In equilibrium, these attendance decisions generate endogenous breakdown risk that depends on market tightness. Under standard matching technologies, more favourable market conditions strengthen a party’s bargaining power. In the frictionless limit, equilibrium outcomes can converge to monopoly or monopsony allocations under additional assumptions on first-mover probabilities.