A key prediction of the kinked demand curve model is that:

a. product differentiation costs more than it is worth.

b. a kinked demand curve makes a cartel more stable.

c. firms in an oligopoly will be able to earn positive profits in the long run.

d. rival firms will match price increases but not price cuts.

e. small changes in costs will have no effect on the price charged by the firm. ??

Product differentiation and cartels are assumed to not exist in the kinked demand curve model. Furthermore, it is a model used to show how rival firms will not match price increases and only price cuts.