In the aftermath of the Global Finance Crisis, there is a pervasive sense that things cannot remain the same -- and yet they do, and no challenger to the pre-crisis consensus has remotely succeeded in displacing it. How has this ideological exhaustion come about? How can it be overcome? We will examine how previous economic and political crises shaped and were shaped by the ideological projects of the twentieth century: liberalism, Marxism, social democracy, and fascism. Particular emphasis will be placed on the relationship between political thought and action -- for instance, which (if either) is fundamental? Thinkers and topics of interest: Keynes, Lenin, Hayek; the Occupy and green movements, anarchism, libertarianism.