Learning about migration through experiments

International migration is one of the most important choices that individuals and households in poor countries can make to increase their lifetime wellbeing. This choice presents a severe challenge to researchers attempting to learn the impacts of migration, since those who choose to move typically differ in a host of observable and unobservable ways from those who choose to stay behind. This paper provides an overview of a new experimental literature which uses policy experiments and researcher-designed experiments to overcome these selection issues. Particular emphasis is placed on discussing the different datagathering strategies needed for conducing policy experiments. Experimental migration research as a field is still in its nascent stages, and there appears to be plenty of scope for both policymakers and researchers to design new experiments going forward - it is hoped that the summary here will aid researchers and policymakers in this purpose.