What Money Can´t Buy: The Moral Limits of Markets

Should we pay children to read books or to get good grades? Is it ethical to pay people to test risky new drugs or to donate their organs? What about hiring mercenaries to fight our wars, outsourcing inmates to for-profit prisons, auctioning admission to elite universities, or selling citizenship to immigrants willing to pay? Isn´t there something wrong with a world in which everything is for sale?