Then the wealthy make all of their big purchases outside the country and import them in. If the country starts taxing purchases made outside the country, then t

Then the wealthy make all of their big purchases outside the country and import them in. If the country starts taxing purchases made outside the country, then those purchases become "gifts from a good friend." There's also the fact that the ultra rich get unbelievably rich because they spend only small fractions of their income, meaning the rich would be paying pretty much nothing in taxes ever.