TY  - JOUR
AU  - Auerbach,Alan J.
AU  - Kotlikoff,Laurence J.
TI  - An Examination of Empirical Tests of Social Security and Savings
JF  - National Bureau of Economic Research Working Paper Series
VL  - No. 730
PY  - 1984
Y2  - March 1984
UR  - http://www.nber.org/papers/w0730
L1  - http://www.nber.org/papers/w0730.pdf
N1  - Author contact info:
Alan J. Auerbach
Department of Economics
530 Evans Hall, #3880
University of California, Berkeley
Berkeley, CA 94720-3880
Tel: 510/643-0711
Fax: 510/643-0413
E-Mail: auerbach@econ.berkeley.edu

Laurence J. Kotlikoff
Department of Economics
Boston University
270 Bay State Road
Boston, MA 02215
Tel: 617/353-4002
Fax: 617/353-4001
E-Mail: kotlikoff@gmail.com
AB  - The effect of social security and other forms of government debt on national savings is one of the most widely debated policy questions in economics today. Some estimates suggest that social security has reduced U.S. savings by almost forty percent. This paper examines recent cross-section and time series empirical tests of the social security-savings question and argues that, given current data, neither type of test has much potential for settling the controversy. In particular, there are a number of specification problems relating to social security time series regressions that can easily lead to highly unstable coefficients and to rejection of the hypothesis that social security reduces savings, even if it is actually true. These points are demonstrated by running regressions on hypothetical data generated by a perfect foresight life-cycle growth model developed previously by the authors. While the data is obtained from a model in which social security reduces the nation's capital stock by almost twenty percent, time series social security regression coefficients vary enormously depending on the specified level of the program, the preferences of hypothetical households, the level of concommitant government policies, and the time interval of the data.
ER  -