Scot,
Your notion of a “market” refers to the neoclassical setting of perfect competition. But this is only one possible setting, even in neoclassical theory. In capitalism, a market is a setting where commodities are exchanged (usually) for money. This is a very general definition that can accommodate any commodity/ies, participants, institutions and patterns of activity.
If you get rid of this concept, how would you describe the reality it refers to?