“…Papers in this area, many of which are devoted to estimating the effect of unions on public sector wages, include Ashenfelter (1971), Bartel and Lewin (1981), Edwards and Edwards ( 1982a, b), Ehrenberg (1973a, b), Ehrenberg and Goldstein (1975), Hall and Vanderporten (1977), Ichniowski (1980), Landon and Baird (1971), Nelson, Stone, and Swint (1981), Schmenner (1973), and Zax (1985). Among these studies, papers that control for labor market monopsony effects bear an especially close relationship to the present research (see, for example, Ehrenberg and Goldstein (1975), Hall and Vanderporten (1977), and Landon and Baird (1971) Finally, by attempting to discriminate empirically between the demandconstrained and efficient-bargain models of collective bargaining, the paper joins a small recent literature directed toward this goal (see Eberts and Stone (1986) and MaCurdy and Pencavel (1986)). The present approach to discriminating between the models is novel and should be of interest to labor economists working in this area.…”