“Why Are 401(k)/IRA Balances Substantially Below Potential?” by Andrew G. Biggs, Alicia H. Munnell, and Anqi Chen (WP No. 2019-14, November 2019, .pdf and Excel format, 27p.). Note: Links to the abstract and the full text of this paper available at:
crr.bc.edu/working-papers/why-are-401k-ira-balances-substantially-below-potential/