EconTalk host Russ Roberts talks about the claim that for capitalism to succeed there have to be people at the bottom to do the unpleasant tasks and that the rich thrive because of the suffering of those at the bottom. He critiques the idea that capitalism is a zero sum game where to get ahead, someone has to fall back. He also looks at the evolution of the least pleasant jobs over time and how technology interacts with rising productivity to make the least pleasant jobs more pleasant.