This is a list of political ideologies. Many political parties base their political action and election program on an ideology. In social studies, a political ideology is a certain ethical set of ideals, principles, doctrines, myths or symbols of a social movement, institution, class, and/or large group that explains how society should work, and offers some political and cultural blueprint for a certain social order. A political ideology largely concerns itself with how to allocate power and to what ends it should be used. Some parties follow a certain ideology very closely, while others may take broad inspiration from a group of related ideologies without specifically embracing any one of them. The popularity of an ideology is in part due to the influence of moral entrepreneurs, who sometimes act in their own interests.