On group Strategy Proof Mechanisms for a many to one Matching Model

MARTINEZ R. MASSÓ J. NEME A. AND OVIEDO J.

Santiago de Chile

Congreso; 4º Congreso Latinoamericano de Economía Teórica.; 2003

Universidad de Chile

For the many-to-one matching model in which firms have substitutableand quota q
separable preferences over subsets of workers we showthat the workers-optimal stable mechanism is group strategy-proof for theworkers. Therefore, in centralized markets like entry-level professional labormarkets if the proposed matching is the workers-optimal stable matchingthen, no group of workers can never benefit by reporting untruthfully theirpreference relations. We exhibit an example showing that this property fails ifthe preferences of firms are substitutable but not quota q
separable.