Using a unique dataset that links the economic and demographic informa
tion of households with the details of their pension formulas, I estim
ate the combined effect of Social Security and pension benefits on the
probability of retirement in a cross-section of the population near r
etirement age. The accrual rate of retirement wealth is shown to be a
significant determinant of the probability of retirement. Simulations
of extensions in pension coverage comparable to those that occurred in
the early postwar period can account for one fourth of the contempora
neous decline in labor force participation rates. (C) 1998 Elsevier Sc
ience S.A. All rights reserved.