The relevance is, when you visit Norway now, you’ll have to buy their tourism through the tax, so there won’t be any point in buying imported tourism from another country as you’ll already have more than enough. Pretty clever really.

Anyway imported tourism is never quite the same as getting it locally. ¯\_(ツ)_/¯

I was having this thought myself but am not familiar enough with international trade to know. It seems to me that bringing down trade barriers outside the US allows coutries to more easily find alternative trade partners to fill the void left by abandoning us ones. It also strengthens the effect on America because they won’t be able to hold as many businesses hostage.