# Power in Weighted Voting Systems

Power in Weighted Voting Systems

A weighted voting system consists of a number of players, each with a certain number of votes, and a quota of votes needed to pass a measure. There are various methods of measuring the "power" that an individual in a weighted voting system has. This Demonstration lets you compare the proportion of votes a player has versus that player's power as measured by the Shapley–Shubik and Banzhaf power indices. The thumbnail shows the famous example [51: 50, 49, 1] of a system with three players having 50, 49, and 1 votes, respectively, and with the quota set at 51 votes. Note that the distribution of power of the voters is very different than the distribution of votes.