"When we ask what ought to be the relative remunerations of a nurse or a butcher, or a coal miner and a judge at a high court, of the deep sea diver of the cleaner of sewers, of the organiser of a new industry and a jockey, of the inspector of taxes and the inventor of a life-saving drug, of the jet-pilot or the professor of mathematics, the appeal to 'social justice' does not give us the slightest help in deciding…"