Leading development economists find that authorized guest workers typically draw massive economic benefits from their work, relative to their best alternatives. They migrate voluntarily, pass on large benefits to their families and home countries, and almost universally return home when guest work programs are well designed. Expanding opportunities for authorized guest work reduces the exploitation of migrant workers by competing directly with the black market for labor. The Center for Global Development is a non-partisan, independent, and non-profit think tank dedicated to reducing global poverty and inequality through rigorous research. This submission briefly summarizes the latest research by myself and other economists regarding the effects of guest work on guest workers.