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.
