How a Can of Beans Became a Two-Pence Credit
A supermarket price below zero turns an ordinary purchase into a promotional subsidy. At minus two pence per can, a shopper buying one can would have two pence taken off the bill rather than added to it. The store was not necessarily handing over coins at the checkout; the negative price could simply reduce the total cost of the shopper’s basket.
That kind of offer makes sense only as part of a larger contest. Supermarkets compete for shoppers who may choose a store based on a few familiar, easy-to-compare staples. Baked beans fit the bill: customers know roughly what a can should cost, so a dramatic cut is immediately noticeable. A retailer can accept a loss on that item in hopes that shoppers will buy other groceries during the same visit—or come to regard the store as the cheaper place to shop.
Why the Price War Couldn’t Last
The gamble has a limit. The more cans a shopper buys, the larger the retailer’s loss on the promotion, while the hoped-for extra spending elsewhere is not guaranteed. For shoppers, the arithmetic runs the other way: buying a whole pallet turns a tiny per-can credit into a substantial discount, especially if the beans can be stored and used later.
That creates a feedback loop. A spectacular price attracts attention; bulk buying makes the deal more expensive for the store; and rival retailers may feel pressure to match it to avoid looking dearer. Once the promotion stops bringing enough benefit to justify the cost, the store can end it. In this case, the bargain was so extreme that some customers bought pallets before the supermarkets called off the price war—a reminder that a “free” grocery item can still be costly to the business offering it.
