International Business Travel: An Engine of Innovation?
---- Acknowledgements -----
We thank two anonymous referees, Jeff Furman, Ben Jones, Jim Markusen, Keith Maskus, Marc Muendler, Jim Rauch, and David Weil, as well as participants at presentations at the University of Colorado, the CEPR GIST (Ljubljana 2010), and the American Economic Association (Denver 2011) conferences for useful comments. We thank Erik Stuen and especially Jennifer Poole for help with the data. The views expressed herein are those of the authors and do not necessarily represent the views of the National Bureau of Economic Research.