@inbook{NBERc3741,
 Crossref = "NBERbeck75-1",
 title = "Appendix B: Mathematical Discussion of Relation between Age, Earnings, and Wealth",
 author = "Gary S. Becker",
 pages = "257-264",
 year = "1975",
 URL = "http://www.nber.org/chapters/c3741",
}