“How Has the Shift to 401(k) Plans Affected Retirement Income?” by Alicia H. Munnell, Wenliang Hou, Anthony Webb, and Yinji Li (IB No. 17-5, March 2017, .pdf format, 8p.).
crr.bc.edu/briefs/how-has-the-shift-to-401k-plans-affected-retirement-income/