We consider the situation in which there are multiple proxies for one unobserved explanatory variable in a linear regression and provide a procedure by which the coefficient of interest can be extracted "post hoc" from a multiple regression in which all the proxies are used simultaneously. This...

Health care in developing countries is often unreliable and of poor quality, reducing incentives to use quality health services. Using data from a field experiment in India, I show that providing initial quality care improves the demand for quality health care by raising intended health...