It is harder to explain the behavior of firms in an oligopoly than in other market structures because:

Group of answer choices

the firms act independently of each other in an oligopoly.

only homogeneous products are produced by firms in an oligopoly.

only differentiated products are produced by firms in an oligopoly.

the demand curve faced by a firm in an oligopoly can slope upward.

firms base their decisions on what their rivals do.