Surge pricing comes to the supermarket

John Wanamaker, who opened his department store in a Quaker district of the city, introduced price tags for his goods, along with the high-minded slogan: "If everyone was equal before God, then everyone would be equal before price." Up until then high-street retailers had generally operated a market-stall system of haggling on most products. Their best prices might be reserved for their best customers. Or they would weigh up each shopper and make a guess at what they could afford to pay and eventually come to an agreement. Wanamaker's idea was not all about transparency, however.