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Proper evaluation of cost-quality trade-offs inherent in regulatory policy requires identifying the structure of production from the behavioral response of quality to the policy change. However, estimating the structure of production with endogenous quality is difficult because of both measurement problems and data availability. We develop a simple method for identifying and estimating cost functions in the presence of endogenous and unobserved quality. Using this method, we estimate that a quality-adjusted cost function for nursing homes treating quality as exogenous yields seriously misleading estimates of marginal cost and economies of scale. We then used the parameter estimates to evaluate the cost-quality trade-off in nursing home regulatory policy.
Gertler et al. (Tue,) studied this question.