Mary S. Morgan, Fellow of the British Academy and Overseas Fellow of the Royal Dutch Academy of Arts and Sciences, is Professor of History and Philosophy of Economics at the London School of Economics and University of Amsterdam. She has published on a range of topics in the history and philosophy of economics: from statistics to experiments to narrative, and from nineteenth-century Social Darwinism to game theory in the Cold War. Her previous books include The History of Econometric Ideas (Cambridge University Press, 1990) and Models as Mediators (Cambridge University Press, 1999, co-edited w...