When Costco sells a product they’ve already bought it (a retailer) on the other hand when Amazon sells something they’re just acting as a middle party for the item in most cases.
That's often not the case. Retailers like Costco, Walmart, Best Buy etc have a wide variety of different selling arrangements. I've sold products through all three and often did so on terms that gave them full right of return for any unsold product as well as significantly delayed payment.
This combination basically nets out to be financially the same as pure consignment. They won't pay me for my product until well after it has sold-thru to an end user. Everything that's unsold comes back to me (and they bill me for shipping both ways!) In the meantime, all I have is basically an "IOU" promise to someday pay IF it eventually sells (and they always drag out the payment beyond the already-extended due date).
Also, if I want to be featured in their circular I have to "buy" that just like an ad in a magazine except the retailer will (usually) DFI (deduct from invoice) the "ad" cost, which means they just owe me less (if and when the product sells and they actually pay). The same is true for getting my product displayed on an end cap or with in-store signage.
The big retailers bring in new products to "test" all the time and do so at basically no financial risk to themselves (other than the opportunity cost of the shelf space) while capturing all the sales data.
I'm not sure how Costco works specifically, but that's not the case in all retail. At GameStop, game publishers only got paid when their games sold not when they were put on the shelves. If there are 100 disk cases put on the shelves for Call of Battlefield and none of them sold, eventually GameStop would return them and the publisher got nothing.
This combination basically nets out to be financially the same as pure consignment. They won't pay me for my product until well after it has sold-thru to an end user. Everything that's unsold comes back to me (and they bill me for shipping both ways!) In the meantime, all I have is basically an "IOU" promise to someday pay IF it eventually sells (and they always drag out the payment beyond the already-extended due date).
Also, if I want to be featured in their circular I have to "buy" that just like an ad in a magazine except the retailer will (usually) DFI (deduct from invoice) the "ad" cost, which means they just owe me less (if and when the product sells and they actually pay). The same is true for getting my product displayed on an end cap or with in-store signage.
The big retailers bring in new products to "test" all the time and do so at basically no financial risk to themselves (other than the opportunity cost of the shelf space) while capturing all the sales data.