The members of the House of Representatives are elected by preferential voting from single-member areas spread among the states and territories roughly in proportion to population. In ordinary legislation, the two chambers have the same powers, but all laws for spending money or charging taxes must come from the House of Representatives. In the Westminster system, the leader of the political party or group of parties that holds the support of a majority of the members in the House of Representatives is asked to form a government and is named Prime Minister.