I have devised a new strategy for dealing with hagglers. When they ask for a discount, I’m going to ask them what they do for a living. Based on some spurious guesswork, I’ll judge whether they earn more than I do, or less. In the extremely unlikely event that they earn less, they can have a 10 per cent discount. In the almost inevitable event that they earn more, they can pay me 10 per cent extra. That’s progressive economics.

