A Fee Market

What is a Fee Market? I've heard this term and even used it without really understanding what it means. I cannot find a definition for it in financial publications, so I'll presume it is meant to be word substitution. So let's figure out what it's supposed to mean. I will try to avoid economics jargon. A market is the space of buyers and sellers to discover price for goods and services (G&S). The prices may be posted or the goods and services may be auctioned. There are many kinds of markets and auctions, but one thing they have in common is that a price is always agreed upon before money is exchanged. G&S prices are compared by buyers and sellers to determine their fairness. Entities buying and selling services may or may not charge a fee. A fee is defined as a fixed charge for a service. The fee may be fixed by either flat amount or fixed proportional rate. A variable rate may be used, but it is unwise to offer without specific schedules agreed upon in a...