Stephen Broadberry is Professor of Economic History at the University of Warwick and a co-ordinator of the Economic History Initiative at the Centre for Economic and Policy Research. His recent publications include The Economics of World War I (2005, as co-editor) and Market Services and the Productivity Race, 1850-2000: Britain in International Perspective (2006). Kevin O'Rourke is Professor of Economics at Trinity College Dublin and a co-organiser of the Centre for Economic and Policy Research's Economic History Initiative. His recent publications include The International Trading System, Globalization and History, 2 volumes, (as editor, 2005) and Power and Plenty: Trade, War, and the World Economy in the Second Millennium (2007, with Ronald Findlay).