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(Choose 1 answer)
(4558)Modeling trade in imperfectly competitive industries is problematic because
A. collusion among imperfectly competitive firms makes usable data rare
B. there are no models of imperfectly competitive behavior.
C. it is difficult to find an imperfectly competitive firm in the real world
D. there is no single generally accepted model of behavior by imperfectly competitive firms.
E. there is only a single model of imperfect competition (monopoly) but imperfect competition can tak forms in the real world.
