american middle class blue-collar worker bourgeois personality bourgeoisie capitalism classless society congressional research service coordinatorism council communism creative class europe feudalism folk culture french revolution genetics gentry gold-collar worker green-collar worker house household income in the united states job security leasing lower middle class lumpenproletariat marxism means of production nobility nouveau riche old money ownership parvenu peasant personal income in the united states petite bourgeoisie pink-collar worker producerism professional proletariat ruling class serfdom slavery social class social network social stratification soviet union tertiary education the lonely crowd tony blair underclass upper class upper middle class wealth white-collar worker working class xiaozi