How much does a carton of eggs cost? Depends on who you are. A new study produced in collaboration with policy group Groundwork Collaborative , Consumer Reports , and More Perfect Union found that people who purchased the exact same product from the exact same store at the exact same time were charged different prices—sometimes up to nearly 25% more—when placing the order on Instacart.

The study tapped 437 volunteer shoppers in four cities who were put in groups that were synced up virtually to add items from a specific grocery store into their Instacart shopping carts at the same time. They then reported the prices that appeared for those researchers to determine if people were being charged different prices for the same goods.

The result was a pretty resounding “Yes.” According t

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