I’m not sure how the Swiss handle trade (except they are not stupid enough to be part of the EU or adopt the Euro), but considering that they are a little country in the mountains with no natural resources, whatever they are doing, it sure as hell works.
One thing that the Swiss had right until the US screwed it up, was taxes and secret banking.
If the US adopted the time honored Swiss approach to taxes (it’s none of our business how you made your money back home, or if you don’t pay taxes in your home country) and allowed the rest of the world to invest and bank in the US in complete secrecy, the US would quickly become a very very wealthy country. That would also become an impregnable defense for the US, as it has for Switzerland. No one could afford to attack their best investment.