Matching market
Markets in which entities (i.e. individuals, households, agencies etc.) seek to be paired with someone or something, with the criteria for matching being highly specific and often requiring reciprocity. For example, a person trying to sell or rent a dwelling set up with existing, expensive disability mobility aids might find the mainstream housing market considers the aids to be of negative economic value, whereas a person who needs the aids would be very pleased to buy or rent such a property and may even pay a premium for the opportunity.