- The "brain drain" thesis (migration reduces human capital in the sending country) is incorrect. When it became easier for Filipino nurses to move to the US, nursing programs expanded in the Philippines, leading to 9 additional nurses for each nurse migrant, thus increasing net human capital. https://direct.mit.edu/rest/article-abstract/doi/10.1162/rest_a_01131/107668/Medical-Worker-Migration-and-Origin-Country-Human?redirectedFrom=fulltext 265 comments science