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The Theory of Political Coalitions
The Theory of Political Coalitions is a book on positive political theory written by William H. Riker published in 1962. It uses game theory to formalize political theory. In it, Riker deduces the size principle. On its postulates, politicians are proved to form winning, minimal-size coalitions. The work runs contrary to a previous theory that politicians try to maximize their respective votes. Riker supposes that attracting more votes requires resources and that politicians run to win. So, a rational politician tries to form a coalition that is as large as necessary to win but not larger.
== Minimal size coalitions ==
An example. Lets imagine a five-party system after a general election. The representation is given:
We now have three possible winning coalitions:
If we now presume that the power will be divided according to strength within the coalition, the parties will prefer the largest relative size within the coalition. The result is that the coalition "Party C and D" will be the winning coalition. The largest party is thus kept from power.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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