Introduction: the world economy in historical perspective -- Economic growth and development: a very long-run view -- Growth theories: old and new -- Managing aggregate economic instability: from Keynes to Lucas -- International economic integration in the second global age -- Interviews. Ben Bernanke (Princeton University, USA). Jagdish Bhagwati (Columbia University, USA). Alan Blinder (Princeton University, USA). Nick Crafts (London School of Economics, UK). Bradford DeLong (University of California, Berkeley, USA). Barry Eichengreen (University of California, Berkeley, USA). Kevin Hoover (University of California, Davis, USA). Charles Jones (University of California, Berkeley, USA). Christina Romer (University of California, Berkeley, USA). Joseph Stiglitz (Columbia University, USA).