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In the context of certain dynamic models of monopsony, it is possible to infer the elasticity of labor supply to the firm from the elasticity of the quit rate with respect to the wage. Using this property, the authors estimate the average labor supply elasticity to public school districts in Missouri. They take advantage of the plausibly exogenous variation in pre-negotiated district salary schedules to instrument for actual salary. Instrumental variables estimates lead to a labor supply elasticity estimate of about 3.65, suggesting the presence of significant market power for school districts, especially over more experienced teachers. This is partially explained by institutional features of the teacher labor market.
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