1. Samuel DuBois Cook Center on Social Equity, Duke University (email: )
2. Samuel DuBois Cook Center on Social Equity and Sanford School of Public Policy, Duke University (email: )
3. Economics Department, University of North Carolina at Chapel Hill (email: )
4. Watson College of Education, University of North Carolina Wilmington and Samuel DuBois Cook Center on Social Equity, Duke University (email: )