In 1954 the Supreme Court of the United States ruled that separate schools for black and white children were 'inherently unequal.' This paper studies whether the desegregation plans of the next 30 years in fact benefited the black students for whom the plans were designed. Analysis of data from...

In 1954 the Supreme Court of the United States ruled that separate schools for black and white children were 'inherently unequal.' This paper studies whether the desegregation plans of the next 30 years in fact benefited the black students for whom the plans were designed. Analysis of data from...

Instrumental Variables (IV) methods identify internally valid causal effects for individuals whose treatment status is manipulable by the instrument at hand. Inference for other populations requires some sort of homogeneity assumption. This paper outlines a theoretical framework that nests all...