By Caroline Petrow-Cohen, Los Angeles Times

The grocery delivery service Instacart is using artificial intelligence to experiment with prices and charge some shoppers more than others for the same items, a new study found.

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The study from nonprofits Groundwork Collaborative and Consumer Reports followed more than 400 shoppers in four cities and found that Instacart sometimes offered as many as five different sales prices for the exact same item, at the same store and on the same day.

The average difference between the highest price and lowest price on the same item was 13%, but some participants in the study saw prices that were 23% higher than those offered to other shoppers.

The varying prices are unfair to consumers and exacerbate a grocery affordability crisis that

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