Columbia subject headings:
Barriers to entry (Industrial organization)--Germany.
Barriers to entry (Industrial organization)--United States.
Consolidation and merger of corporations--Germany.
Consolidation and merger of corporations--United States.
Harvard subject headings:
Antitrust law--Germany
Antitrust law--United States
Barriers to entry (Industrial organization)--Germany.
Barriers to entry (Industrial organization)--United States.
Consolidation and merger of corporations--Germany.
Consolidation and merger of corporations--United States.
Princeton subject headings: