Cristina Mastropasqua
Research Department of Banca d'Italia. They wish to thank G. Galli, G. Gomel, J. Martens, F. Papadia, S. Rebecchini and two anonymous referees for useful suggestions; and S. Marchese for his help in searching and interpreting data. Particular thanks also to L. Cerioni for her assistance in data processing. The authors only are responsible for opinions and errors.
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