Acemoglu, Daron; Shimer, Robert - C.E.P.R. Discussion Papers - 1997
, equilibrium wage dispersion is necessary for the economy to approximate efficiency. Without wage dispersion, workers do not search … or more of the posted wages, i.e. search, before deciding where to apply. Both with homogeneous and heterogeneous forms …, and wages are depressed. As a result: (a) there is excessive entry of firms; and (b) because, in the absence of search …