Columbia subject headings:
Harvard subject headings:
Comparative advantage (International trade)
Foreign trade and employment--Canada.
Foreign trade and employment--United States.
Free trade--North America
Government purchasing--Law and legislation--United States--States.
North American Free Trade Agreement
Unemployment--Canada
Unemployment--United States
Princeton subject headings:
Comparative advantage (International trade)
Foreign trade and employment--Canada.
Foreign trade and employment--United States.
Free trade--North America.
Government purchasing--Law and legislation--United States--States.
North American Free Trade Agreement
Unemployment--Canada.
Unemployment--United States.