The products can be differentiated from a qualitative point of view. In [10], 'bads', providing disutility to households, are sold tied (bundling) to ordinary goods, the 'goods'. This is a work on advertising that is a two-sided market. In [2], the quality is endogenous produced by the meeting of offerers and applicants who are all different: more or less competent or talented with varied distributions to study the phenomenon of superstars from the pairings between artists and amateurs of culture.
Contribution of the axis: Pursue and develop the only 'complete' economic model of the balance between more or less talented suppliers and their applicants, the resulting matches, and a notion of balanced equilibrium. Understand the role of the form of agent distributions in the type of matching and the form of the price quality relationship. Offer better matches (matching optimal) than those determined by the market that lead to superstars.