Huber, Martin Mellace, Giovanni 2015 We derive testable implications of instrument validity in just identified treat- ment effect models with endogeneity and consider several tests. The identifying assump- tions of the local average treatment effect allow us to both point identify and bound the mean potential outcomes (i) of the always takers under treatment and (ii) of the never takers under non-treatment. The point identified means must lie within their respective bounds, which provides us with four testable inequality moment constraints. Finally, we adapt our testing framework to the identification of distributional features. A brief simulation study and an application to labor market data are also provided. application/pdf https://folia.unifr.ch/global/documents/307111 https://folia.unifr.ch/documents/307111/files/testinginstrumentvalidityforlateidentificationbasedoninequalitymomentconstraintsreviewofeconomicsandstatistics972398-4112015.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1162/REST_a_00450 info:eu-repo/semantics/openAccess License undefined Review of economics and statistics. - 2015, vol. 97, no. 2, p. 398-411 Inequality moment constraints Instrument LATE Specification test Treatment effects info:eu-repo/classification/udc/33 Testing instrument validity for LATE identification based on inequality moment constraints http://purl.org/coar/resource_type/c_6501