"We analyse the wage choice of a monopoly union against entry threat. The wage carries information about market demand, which is crucial to an uninformed entrant, and in addition affects the entrant's post-entry cost through labour market institutions. The union may wish to deter or accommodate entry depending on whether the entrant will hire from a different source or from the union. Equilibrium wage is distorted downwardly (upwardly) for deterrence (accommodation); but because of wage correlation a low (high) wage can also turn entry profitable (unprofitable). Therefore, separating equilibrium may not always exist, and entry outcomes may be inefficient."

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