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What is Buy Box?
Also known as Featured Offer
The Buy Box is the Add to Cart panel on an Amazon product page shared by multiple sellers. The seller who wins it receives the overwhelming majority of that page's sales.
Why it matters
Winning it depends on price including shipping, fulfilment method, seller performance metrics and stock availability. FBA offers are advantaged, and price alone does not decide it.
Losing the Buy Box on a shared ASIN effectively removes your sales on that product even though your offer remains live. It is worth monitoring as a metric in its own right.