Why does ChatGPT quote a marketplace seller's price as the retailer's price?

Asked for the cheapest price, it took the lowest number it could find, and on retailer sites with marketplace sellers that was often a third-party offer.

Updated

Asked where a product is cheapest, ChatGPT took the lowest number it could find. On retailer sites that also list marketplace sellers, open-box or refurbished units, that number was often not the store's own price. In Core dna's November 2026 US test, four of the 13 wrong prices were marketplace sellers on Best Buy and Walmart presented as the store's own. A Garmin listing ChatGPT called Best Buy's "lowest verified advertised price" was a third-party seller charging $99.99 for shipping.

Naming the seller and condition for every offer, on the page, in structured data (the seller and itemCondition fields of each Offer) and in product feeds, makes the store's own price easier to tell apart. Product Feed Optimization for AI Shopping covers the data work.

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