Milkman and Mitchell (1995) extend Rosen's (1969) threat-effect hypoth
esis to suggest that the threat of unionization can induce inefficient
underutilization of labor by nonunion firms. if films follow this str
ategy, the apparent paradox of competitive coexistence in the face of
higher union wages reflects induced nonunion firm inefficiency rather
than superior union firm efficiency. Furthermore, this strategy decrea
ses demand for nonunion workers in a partially unionized industry A ge
neralized cost function analysis of data from sawmills in the Pacific
Northwest yields evidence that nonunion firms use this strategy.