NEW YORK (CNN) — Online grocery delivery service Instacart used AI to charge different prices for the same item, up to 20% more for different shoppers, a new report says.

An investigation from Consumer Reports and Groundwork Collaborative revealed Tuesday that Instacart displayed different prices on the same household staples sold at well-known stores, including Albertsons, Costco, Kroger, Safeway and Target. The report said customers are “unknowingly part of widespread AI-enabled experiments.”

“Corporate practices like these increase prices for American families. When prices are no longer transparent, shoppers can’t comparison-shop. When prices are no longer predictable, shoppers can’t properly budget,” the organizations said in the report.

The report found that Instacart uses

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