Because the US Dollar is the predominant world reserve currency, and has continued to be through several significant shocks to the system. In 2008 it looked lik

Because the US Dollar is the predominant world reserve currency, and has continued to be through several significant shocks to the system. In 2008 it looked like the EU had a chance to significantly adjust that balance in favor of the Euro, but the EU went down the austerity path in handling member states problems, which slowed their recovery, and made the US Dollar still the least bad option on the table. Because of this dynamic, the rules end up being different for countries like the US. I wish more economic research went into this end of things to try to study the boundaries and nuances of this altered reality. But, instead we're still stuck interacting with the world mostly through the lens of neoclassical models. Which, if I'm being frank, are basically to economics what the lobotomy was to neurology.