Example: Amazon sells a dongle for $20, the competitors sell them for $20. Amazon makes a deal with each competitor, then raises all the prices to $25.
(edit) I think this kind of example also: The competitor's dongle is priced at $24 on Best Buy. Amazon raises competitor's the price to $24, but keeps its own dongle priced at $20.
> The “Sold by Amazon” program resulted in prices for some products increasing when Amazon programmed its pricing algorithm to match the prices that certain external retailers offer to online consumers.
> As a result, when prices increased, some sellers experienced a marked decline in the sales and resulting profits from products enrolled in the program. Faced with price increases, online customers sometimes opted to buy Amazon’s own branded products — particularly its private label products. This resulted in Amazon maximizing its own profits regardless of whether consumers paid a higher price for sales of products enrolled in the “Sold by Amazon” program or settled for buying the same or similar product offered through Amazon.