Why should we pay attention to the great social critics like Marx? Americans, especially now, confront serious questions and evidences that our capitalist system is in trouble. It clearly serves the 1% far, far better than what it is doing to the vast mass of the people. Marx was a social critic for whom capitalism was not the end of human history. It was just the latest phase and badly needed the transition to something better. We offer this essay now because of the power and usefulness today of Marx's criticism of the capitalist economic system.