Competitor prices vary by surface and fees, so one price per product misleads

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A product's price is not a single figure, since the same item can cost different amounts on a retailer site, a marketplace, a grocery delivery service, and a delivery app. Each surface is set by different parties, including the seller's own margins, marketplace seller rules, and platform markups or fees. Storing one price field per product either overwrites useful data or averages it into a figure no customer actually paid. The author recommends recording each observation with its surface, location, fee components, and shopper context. Fee stacks can shrink or enlarge the gap between items: in one example, a 21.7% item-price gap narrowed to 9.1% once delivery and service fees were added.

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