The Celler-Kefauver Act of 1950 plugged a technical loophole in the Clayton Act which permitted many large horizontal mergers

When oligopolists take into account their competitors' behavior, this situation is called:

a. mutual interdependence. b. monopolistic competition. c. independent. d. price discrimination. e. loss minimization.

If an industry has 25 firms that collectively have $150 million in total sales and the top four firms in this industry account for $90 million in sales, what is the concentration ratio of the top four firms in this industry?

A) 42 percent B) 60 percent C) 70 percent D) 80 percent