Columbia subject headings:
Industrial productivity--United States.
Labor laws and legislation--Compliance costs--United States.
Labor laws and legislation--United States--Compliance costs.
Labor unions--United States.
Wages--United States.
Harvard subject headings:
Industrial productivity--United States.
Labor laws and legislation--Compliance costs--United States.
Labor unions--United States
Wages--United States.
Princeton subject headings:
Industrial productivity--United States.
Labor laws and legislation--United States--Compliance costs.
Labor unions--United States.
Wages--United States.