What can Keynesian economics mean in the 21st century? Do globalisation, inflationary pressures and supply-side constraints make managing demand in a domestic economy impossible? Or could its use to tackle unemployment be put back on the political agenda? These essays examine the potential relevance of Keynesian policies for Europe, America, the developing world and the global economy. There is no common definition, but Keynesianism is throughout seen as more than demand management, with policy proposals to promote investment, strengthen the supply-side and reduce uncertainty.