And a portion of the products that can be purchased from "Amazon.com" (the seller) are JIT orders that Amazon places with the supplier. This is why some products on Amazon are perpetually never "in stock" until a future date on the store listing page; Amazon has made the decision based on sales data to only order those products on demand. In such cases, the supplier will usually ship to Amazon for transshipment to the customer, but depending on the cost of logistics, Amazon may have them ship directly to the customer.
And a portion of the products that can be purchased from "Amazon.com" (the seller) are JIT orders that Amazon places with the supplier. This is why some products on Amazon are perpetually never "in stock" until a future date on the store listing page; Amazon has made the decision based on sales data to only order those products on demand. In such cases, the supplier will usually ship to Amazon for transshipment to the customer, but depending on the cost of logistics, Amazon may have them ship directly to the customer.