5  James J. Heckman and Pedro Carneiro, "Human Capital Policy," in James J. Heckman and Alan B. Krueger, eds., Inequality in America: What Role for Human Capital Policies? (The MIT Press, 2003), and Rob Grunewald and Arthur Rolnick, "A Proposal for Achieving High Returns on Early Childhood Development," Federal Reserve Bank of Minneapolis, May 2005.
6  Yolanda Kodrzycki, "College Completion Gaps between Blacks and Whites: What Accounts for the Regional Differences," New England Economic Review, Federal Reserve Bank of Boston, First Quarter 2004. 7  U.S. Census Bureau of the Census, Education and Social Stratification Branch, Current Population Survey Report, Historical Tables, Table A-5a (Excel file).