Constitutional analysis: The power index approach

A power index approach to the EU institutions gives a new perspective upon the EU institutions and their future reform. Using a standard power measure, the Banzhaf index, we show that in a group of states as the EU council, the voting power of a member state is equal to twice the individual power to block multiplied by the group's collective power to change. Political power of the member states is calculated under alternative constitutional rules for the EU, where cooperative game theory allows the derivation of power equivalences. We suggest that simple majority should be used more often in the EU council.