Want the same milk and eggs? Instacart might charge you more than your neighbor

Instacart’s artificial intelligence-enabled pricing may be increasing the cost of your groceries by as much as $1,200 a year, according to a new study published on Monday.

Instacart is an online grocery delivery and pickup service that allows customers to order groceries from local stores by using its technology platform, via app or its website, and then fulfills those orders through a personal shopper.

The investigation from Consumer Reports and Groundwork Collaborative, a progressive policy group, found that some identical products were priced differently from one customer to the next—sometimes by as much as 23%. One company executive reportedly called the tactic “smart rounding” in an email between Instacart and Costco that Consumer Reports says was inadvertently sent to the magazine