In Federalist No. 10, Madison discusses the advantages and disadvantages that different sized republics would have when it comes to the quality of their democracy. He believes that a small society would have a worse chance to successfully exercise self-government because such a society would more easily succumb to "factions." Factions are groups that pursue their own goals as opposed to the common good. In a small society, undesirable ideas can very quickly spread to a lot of people. Therefore, he favors the creation of large republics.