Columbia subject headings:
Cost and standard of living--United States--Longitudinal studies.
Income distribution--United States--Longitudinal studies.
Working class--United States--Longitudinal studies.
Harvard subject headings:
Cost and standard of living--United States--Longitudinal studies.
Income distribution--United States--Longitudinal studies.
Working class--United States--Longitudinal studies.
Princeton subject headings:
Cost and standard of living--United States--Longitudinal studies.
Income distribution--United States--Longitudinal studies.
Working class--United States--Longitudinal studies.