Hi, I have a student trying to analyze a panel with international trade. His idea was to include the geographic distance of the countries as a control variable to explain (part of) trade. However, this data is invariant between years. A professor in his committee suggested changing to logistics costs between the pair of countries, which would vary over the years. Would anyone know a source (or a way to estimate) such costs? Any feedback is greatly appreciated. Best regards, Iuri. _____________________________________________ Dr. Iuri Gavronski Assistant Professor Programa de Pós-Graduação em Administração Universidade do Vale do Rio dos Sinos – UNISINOS Av. Unisinos, 950 – São Leopoldo – RS – Brasil Sala (Room) 5A 407 D 93022-000 www.unisinos.br TEL +55-51-3591-1122 ext. 1589 FAX +55-51-3590-8447 Email: [log in to unmask] CV Lattes: http://lattes.cnpq.br/8843390959025944 ____ AIB-L is brought to you by the Academy of International Business. For information: http://aib.msu.edu/community/aib-l.asp To post message: [log in to unmask] For assistance: [log in to unmask] AIB-L is a moderated list.