"While many of the world's richest people live in London, four of its boroughs rank among the twenty poorest in England, and 27 percent of the city's population live in poverty. London's polarized economic landscape is typical of "superstar" cities. Other leading cities of Europe—Oslo, Amsterdam, Athens, Budapest, Madrid, Prague, Riga, Stockholm, Tallinn, Vienna, Vilnius—also suffer widening gaps between the top and the bottom of the social hierarchy."