According to my husband, who is an economist, UNOS is, in fact, a monopoly.In economics, a monopoly (from Greek monos / μονος (alone or single) + polein / πωλειν (to sell)) exists when a specific individual or an enterprise has sufficient control over a particular product or service to determine significantly the terms on which other individuals shall have access to it. Monopolies are thus characterized by a lack of economic competition for the good or service that they provide and a lack of viable substitute goods. The verb "monopolize" refers to the process by which a firm gains persistently greater market share than what is expected under perfect competition.
So, I see presumed conscent as a deal where if the donor can be harvested (bad word) they just do it unless the family says "hey, if you are thinking about taking a kidney..... well don't). On second thought that would go over like a lead balloon in this country.