Robert Fogel won the Nobel Prize in Economics in 1993 for developing a technique of running large amounts of numerical data through computers to draw conclusions. He applied this method in his book Time on the Cross, where he argued that slaves in the American South were treated better economically than free industrial workers in the North. However, historians criticized this idea because he overlooked the psychological impact of slavery. Currently, Fogel believes that liberals should stop complaining about economic inequality if poor people today have access to similar amenities as the rich.