The Big Society was a political ideology developed in the early 21st century. The idea proposes "integrating the free market with a theory of social solidarity based on hierarchy and voluntarism". Conceptually it "draws on a mix of conservative communitarianism and libertarian paternalism". Its roots "can be traced back to the 1990s, and to early attempts to develop a non-Thatcherite, or post-Thatcherite, brand of UK conservatism" such as David Willets' Civic Conservatism and the revival of Red Toryism. Some commentators have seen the Big Society as invoking Edmund Burke's idea of civil society, putting it into the sphere of one-nation conservatism.