1. Department of Sociology, Johns Hopkins University, Baltimore, MD 21218.
2. Department of Sociology, University of Pennsylvania, Philadelphia, PA 19104.
3. Chapin Hail Center for Children, University of Chicago, Chicago, IL 60637.
4. Family Policy Studies Centre, London NW1 6XE, United Kingdom.
5. Department of Economics, University of Miami, Coral Gables, FL 33124.