[1] Univ London, Egham TW20 0EX, Surrey, England
[2] CAP, Northfield, IL USA
[3] Univ Lorraine, F-54000 Nancy, France
[4] BETA CNRS, Strasbourg, France
[5] CREST ENSAE, Paris, France
[6] UCL, Dept Econ, London WC1H 0AX, England
[7] Sci Po, Paris, France
[8] Sci Po, Dept Econ, F-75007 Paris, France
[9] UCL, London, England