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Dear list members, I would be very grateful if someone could give me any bibliography references or information on published reports/studies dealing with the following problem: Which kind of relationship does exist between number of kilometers traveled and GDP both for passengers and freight fluxes of transport? Does an increment of GDP induces a more than proportional increment of the number of trips? Thanking all in advance, I'm looking forward to read your answers. Elena Maggi ISTIEE-University of Trieste Via del Lazzaretto Vecchio, 13 34123 Trieste Tel. +39-40-311464 Fax +39-40-311465 E-mail: [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%