Abstract
Several attempts have been made recently to explain the formation of coalitions, especially government coalitions. Most of these theories assume that each of the actors involved (political parties in the case of government coalitions) uses only one criterion — such as the ‘size’ of the coalition or its ‘ideological diversity’ — in choosing between alternative coalitions. The criterion yields for each actor a preference ranking of all the possible coalitions. It is then assumed that the coalitions which are most likely to form are those which are ‘in equilibrium’ or ‘undominated’, a coalition T being undominated if there is no other coalition which is preferred by all its members to T.

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