Well, that's kind of pretty... but perhaps there's a better way to show individual good flows? I see a rainbow between the USA and Mexico, for example, but I can't really make out which colors are going where.

Perhaps if each color had its own location on each country's map? This would add confusion, in that folks might thing the location is where the good comes from ("Why is wheat coming out of Virginia?"), but it would allow seeing that (say) Mexico exports "X" times more food to the USA than the other way around.