The income change was the product of relatively high wages for trade union workers, lack of foreign manufacturing competition and political support for redistributive government policies. By 1947 more than a third of non-farm workers were union members. Unions both raised average wages for their membership, and indirectly, and to a lesser extent, raised wages for non-union workers in similar occupations. Economist Paul Krugman claimed that political support for equalizing government policies was provided by high voter turnout from union voting drives, Southern support for the New Deal, and prestige that the massive mobilization and victory of World War II had given the government.