Businesses are offered software that spots which customers will pay more

IN MANY types of face-to-face retailing, it pays to size up your customer and tailor your offering accordingly. In a 2006 study of Fulton fish market in New York, Kathryn Graddy of Oxford University found that dealers regularly charged Asian buyers less than whites because the Asians had proved, over time, more willing to reject high prices, and readier to band together to boycott dealers who ripped them off.