At the level of the individual, there is a large literature, generally related to the work of Jacob Mincer, on how earnings are related to the schooling and other human capital. This work has motivated a large number of studies, but is also controversial. The chief controversies revolve around how to interpret the impact of schooling. Some students who have indicated a high potential for learning, by testing with a high intelligence quotient, may not achieve their full academic potential, due to financial difficulties.[citation needed]
Literature on how earnings and how it relates to schooling was greatly influenced by who? This view of how schooling and earnings has sparked a lot of studies, but what else has it brought up? What was one of the main concerns of this literature on how schooling and earnings?