Does your online grocery order ever feel fishy, like the prices just aren’t adding up? It turns out you’re right to be suspicious — and now we have compelling evidence.

New research by a consortium of groups including Groundwork Collaborative, Consumer Reports, and More Perfect Union have found evidence of a massive experiment being run on consumers by grocery delivery company Instacart.

The researchers’ experiments found evidence that Instacart — which calls itself “the largest online grocery marketplace in North America” — has been charging some customers up to 23 percent more than others for the same product at the same location.

To gather the info, the three groups compiled data from 437 Instacart shoppers browsing stores in several American cities. All together, the price for the e

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