A multi-party system, such as the two-party system of the United States, is believed to do a better job of promoting the public good than a one-party system.
Multi-party systems are beneficial to promoting the public good in four major ways. First, according to Education Portal, a two-party system presents information in a way that is easy to understand and convenient to consume. Second, two-party systems represent a wider variety of views and opinions. Third, two-party systems discourage rapid shifts in political trends and climate. Finally, two-party systems encourage more political participation because of their ability to represent multiple opinions.