) coalitional equilibrium, describe a (cooperative) partition form game. A coalition is core-stable if the core of a suitable …We propose a semi-cooperative game theoretic approach to check whether a given coalition is stable in a Bayesian game … possible explanation for cartels' structures (not) observed in practice. -- auctions ; Bayesian game ; collusion ; core …

In auctions with externalities, it is well-known that the core can be empty, which is undesirable both in terms of … the sense that the seller and the bidders experience justified envy. We show that the core is nonempty if bidders cannot …