bourgeoisie building classless society construction creative class diploma gentry gold-collar worker green-collar worker grey-collar high school information revolution lower middle class lumpenproletariat maintenance manual labour manufacturing mechanic middle class mining nobility nouveau riche ohio old money parvenu peasant pennsylvania petite bourgeoisie pink-collar worker proletariat restaurant ruling class serfdom service economy slavery social class social stratification trade union underclass uniform upper class upper middle class wage western world white-collar worker working class