author={Caroline Minter Hoxby and Andrew Leigh},
There are two main hypotheses for the decline in the aptitude of public school teachers since 1960: improved job opportunities for females in other occupations and the compression of teaching wages owing to unionization. Using data on several college graduating cohorts from 1961 to 1997, we investigate both hypotheses. To separate the hypotheses, we exploit the fact that states varied considerably in the progress of unionization and female wage parity. We proxy for a teacher's aptitude with the… 

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