What is most common source of faction according to Madison?

According to James Madison, the most common source of faction is the unequal distribution of property and wealth. In Federalist No. 10, he argues that differing interests and opinions arise from varying economic conditions, leading individuals to form factions that seek to advance their own interests. This diversity of interests can create conflict, but Madison believes that a large republic can help mitigate the negative effects of factions by diluting their influence through a multiplicity of interests.