Columbia subject headings:
Cost and standard of living--United States.
Labor supply--United States.
Wages--United States.
Working class--United States.
Harvard subject headings:
Cost and standard of living--United States.
Labor supply--United States.
Labor--United States
Unemployed--United States
Wages--United States.
Working class--United States
Princeton subject headings:
Cost and standard of living--United States.
Labor supply--United States.
Labor--United States.
Wages--United States.