We investigate the mechanism that provides the optimal decision rule for two agents making joint decisions. It is shown that, a special rectangular mechanism with two sided screening, elicit correct information when agents?preferences are private information. Such mechanism is presented as a...

In the problem of locating multiple public facilities studied by Barbera and Bevia [2, 3], we offer simple necessary and sufficient conditions for efficiency, decentralizability of efficient decisions in a game of community division and local public goods provision, and a constructive algorithm...