> For example, perhaps the massive shift in summer vacation travel from all points of the US towards FL was (while very good economically good for FL) both bad

> For example, perhaps the massive shift in summer vacation travel from all points of the US towards FL was (while very good economically good for FL) both bad economically for the rest of the country and created substantial externalities within FL itself (environmental, social etc.) When I said an "increase" in value add, I meant an economy-wide increase in value-add, so the argument of taking business away from other tourist destinations doesn't apply. If you want to claim there is some economic loss as a result of "social losses", then you need to again demonstrate that loss in terms of economic value-add and it will roll up to the economy-wide value add figure above, otherwise we have once again left pigovian territory and are back in "sin tax" land. Transportation just has huge positive externalities, and I don't see any of them being entered into the equations when claiming that more taxes are warranted because of externalities.