8Pereira, P. and P. Martins 2001, Is There a Return- Risk Link in Education?Discussion Paper No. 321.
9Pereira, P. and P. Martins 2000. Does Education Reduce Wage Inequality? Quantile Regressions Evidence from Fifteen European Countries, IZA Discussion Paper 120, Bonn.
10Card, D. 1994. Earnings, Schooling and Ability Revisit- ed. National Bureau of Economic Research Working Paper 4832.
3Bowen H tL The costs of higher education: how much do colleges and universities spend per student and how much should they spend[M]. San Francisco: Jossey Bass Pub- lishers, 1980 .. 1-26.
4College Board. Tuition and fee and room and board charges over time,2005--2006 to 2015--2016 [EB/OL]. [2014-10 -20]. http://trends, collegeboard, org/college-pricing/fig- ures-tables/tuition-and- fees-and-room-and-board-over-time -2005-06-2015-16.
