To add, a general argument is that retailers buy their stock and thus have the right to analyze sales of it, but this is a dying practice. Costco, for instance,

To add, a general argument is that retailers buy their stock and thus have the right to analyze sales of it, but this is a dying practice. Costco, for instance, demands a 6 month delayed payment on inventory[0], which effectively means they are following the Amazon route by being a marketplace for inventory which the distributor still owns. 0: https://youtu.be/mvk5tVMZQ_U?t=7195 https://youtu.be/mvk5tVMZQ_U?t=7195