As electronic labels roll out in grocery stores across the U.S., consumers and lawmakers fear they could lead to surge pricing.

The Federal Trade Commission wants to know how firms are using surveillance pricing as ever more data on consumers is collected.

“If you don’t have any idea when or why a price might change, it creates a sense of urgency and a sense of scarcity,” says Amanda Mull at Bloomberg.

The cost of a pint of beer is going to go up at busier times in hundreds of pubs owned by the Stonegate Group.

Online retailers are changing their prices multiple times a day, raising prices when they can, lowering them when they must. Want a better deal? Wait 10 minutes.