 Charles Beitz argues that single member district representation encourages moderation in party programs offered for citizens to consider (Beitz 1989: ch. 7). This results from the tendency of this kind of representation towards two party systems. In a two party system with majority rule, it is argued, each party must appeal to the median voter in the political spectrum. Hence, they must moderate their programs to appeal to the median voter. Furthermore, they encourage compromise among groups since they must try to appeal to a lot of other groups in order to become part of one of the two leading parties. These tendencies encourage moderation and compromise in citizens to the extent that political parties, and interest groups, hold these qualities up as necessary to functioning well in a democracy.