Columbia subject headings:
Restraint of trade--United States--Mathematical models--Case studies.
Tariff--United States--Mathematical models--Case studies.
United States--Commercial policy--Mathematical models--Case studies.
Harvard subject headings:
Import quotas--United States.
Industrial policy--United States
Restraint of trade--United States--Mathematical models--Case studies.
Tariff--United States--Cases.
Tariff--United States--Mathematical models--Case studies.
Trade regulation--United States
United States--Commercial policy--Mathematical models--Case studies.
Princeton subject headings:
Case studies.
Restraint of trade--United States--Mathematical models--Case studies.
Tariff--United States--Mathematical models--Case studies.
United States--Commercial policy--Mathematical models--Case studies.