In the 1950s, Olof Palme and the prime minister Tage Erlander formulated the basis of Swedish social democracy and what would become known as the "Swedish model", drawing inspiration not from reformist socialism but from the American economist John Kenneth Galbraith and the liberal ideas he articulated in "The Affluent Society". The ideological basis of the Swedish "affluent society" rested on a universal welfare state providing citizens with economic security whilst simultaneously promoting social solidarity, representing a break with earlier notions of selective welfare provision in Sweden. The Swedish model was characterized by a strong labor movement as well as inclusive publicly-funded and often publicly-administered welfare institutions.