We propose a new specification test for assessing the validity of fuzzy regression discontinuity designs (FRD‐validity). We derive a new set of testable implications, characterized by a set of inequality restrictions on the joint distribution of observed outcomes and treatment status at the...

Financial aid decreases the cost of acquiring additional education. By using Italian administrative and survey data on financial aid recipients and exploiting sharp discontinuities in the amount of aid received, this paper identifies the causal effect of aid generosity on college performance and...