Contributor(s): Professor Hillel Steiner, Dr Nicholas Vrousalis | Child labour, sweatshops and low wages: there are many market exchanges that strike us as morally problematic because they are exploitative. But what exactly is exploitation? And how could a voluntary and mutually beneficial exchange be morally wrong? Hillel Steiner is professor of political philosophy at the University of Manchester. Nicholas Vrousalis is assistant professor in political philosophy at Leiden University, Netherlands.