1. Bureau of the Census, Curr. Popul. Rep., Ser. P-60 (no. 161) (1988), table 16.
2. Preston S., Demography 21, 435 (1984).
3. Palmer J., Smeeding T., Torrey B. B., Eds., The Vulnerable (Urban Institute Press, Washington, DC, 1988).
4. Smeeding T. Torrey B. Rein M. in ( 3 ) pp. 89–119.
5. Ward M., Purchasing Power Parities and Real Expenditures in the OECD (OECD, Paris, 1985), p. 117.