1. Sex Ratio of Population Note: See endnote 8 for a discussion of the sex ratio and seniors' increasing longevity;Sources: Census Bureau
2. Is a Student Loan Crisis on the Horizon?;Beth Akers;Brown Center on Education Policy at Brookings,2014
3. The Polarization of Job Opportunities in the U.S. Labor Market: Implications for Employment and Earnings;David H Autor;American Economic Review,2010
4. The Polarization of the U.S. Labor Market;---;American Economic Review,2006
5. Board of Trustees, Federal Old-Age and Survivors Insurance and Federal Disability Insurance Trust Funds;Zachary Bleemer;The 2014 Annual Report of the Board of Trustees of the Federal Old-Age and Survivors Insurance and Federal Disability Insurance Trust Funds, House of Representatives Document,2014