"For many online shops, the cost of a free shipment is either folded into the prices for items or funded by investors." No kidding. I'm having trouble imaginin

"For many online shops, the cost of a free shipment is either folded into the prices for items or funded by investors." No kidding. I'm having trouble imagining how the cost of free shipments is paid for by the remaining shops, if there are any. (Amazon Prime is pre-paid, unmetered, not free, shipping)