U.S. consumers are uneasy about the increasingly high-tech ways that restaurant chains and major retailers are setting prices. Digital price tags are replacing paper ones in grocery aisles. Artificial intelligence tools help businesses decide what to charge by predicting how customers might respond. Terms like “dynamic pricing” and “surveillance pricing” are stirring up anger and anxiety on social media. Much of the concern focuses on whether customer data is getting used to give different people different prices for the same product. Walmart and McDonald's say critics misunderstand how their pricing tools work. Lawmakers and regulators are taking preemptive action to restrict when companies can use personal data in pricing.