When you order a ride with Lyft, a contract is established between you and Lyft.  You pay Lyft $10.  Payment to the driver is a cost incurred by Lyft in providing services to you.<p>When you order something on eBay, a contract is established between you and the seller.  You pay the seller $10.  The seller gives eBay a cut.  eBay&#x27;s cut is a cost incurred by the seller in providing goods to you.