Source: Raimond Maurer, Olivia S. Mitchell, Ralph Rogalla, and Tatjana Schimetschek, Wharton School of the University of Pennsylvania, Pension Research Council, PRC Working Papers, WP2014-22, October 2014
From the abstract:
This paper investigates whether exchanging the Social Security delayed retirement credit, currently paid as an increase in lifetime annuity benefits, for a lump sum would induce later claiming and additional work. We show that people would voluntarily claim about half a year later if the lump sum were paid for claiming any time after the Early Retirement Age, and about two-thirds of a year later if the lump sum were paid only for those claiming after their Full Retirement Age. Overall, people will work one-third to one-half of the additional months, compared to the status quo. Those who would currently claim at the youngest ages are likely to be most responsive to the offer of a lump sum benefit.