, was only a scapegoat. Keywords: groups, coalitions, alliances, endogenous formation, cost reduction, loss of control … decisions a group takes and the ones an indi- vidual would have taken on their own as a cost associated with the loss of control … cost associated with the partial loss of control over the decisions a group takes. Second, it analyzes how the governance …

' associated with the partial loss of control over the decisions the partnership takes. For instance, by forming a monetary union …, countries benefit from a more coordinated monetary policy. However, due to the partial loss of control over the union decision …