Like I said, I think people are taking the financial situation of Germany, Italy, and Japan in the 1930s, and putting it in the Star Wars universe, which is not how things work. Those nations did not have full autarky, but depended on foreign nations for trade of resources and products. To finance the war they basically loaned money from whoever was offering. The problem is the Star Wars writers are doing the same faulty logic like the morons who read Wages of Destruction and think the Third Reich would have a financial crash once they were no longer at war, which is not how it would go. The goal was always autarky, at that point foreign trade, credit ratings, foreign banks, it holds no meaning.
A galactic empire has to be by definition self sufficient, it's not like they're going to depend on the Hutt Cartel for food or medicine. Why would Palpatine need to take loans? And who would he have to loan from?