According to Marx, is there a tendency for the rate of profit to fall? On what assumptions is this argument based? What are the counteracting forces that may forestall such a fall? What is the “internal contradiction” of “the law of the tendency of the rate of profit to fall” and what is its significance? What is the nature of crises associated with the falling rate of profit? What are “realization crises”? How do crises associated with the falling rate of profit differ from realization crises?