It also demonstrates that individuals with similar levels of educational attainment vary in their information-processing proficiency, which may reflect differences in innate ability as well as variation in the quality and degree of skills acquisition, both in and outside the education system. All other things being equal, educational attainment and specific skills related to field of study have a strong effect on entry wages, although the education-wage relationship weakens somewhat with age/experience. College graduates receive sizeable wage premia, although those who have degrees in the humanities or in teacher training and education earn less than social science graduates.