Radical democracy was articulated by Ernesto Laclau and Chantal Mouffe in their book Hegemony and Socialist Strategy: Towards a Radical Democratic Politics, written in 1985. They argue that social movements which attempt to create social and political change need a strategy which challenges neoliberal and neoconservative concepts of democracy. This strategy is to expand the liberal definition of democracy, based on freedom and equality, to include difference.