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What is the rationale behind stock markets retreating due to S&P having a negative outlook on the USA?
I think a big part of the issue is ignorance. For instance, the US govt cannot default on its loans, yet you keep hearing people speak as if it could. The US govt also does not have to borrow to pay for anything, it creates its own money whenever it wants. These 2 facts often evade many people, and they feel the US govt should act like a household, business, or a state govt. This disconnect leads to a lot of confusion, and things like "fiscal crisis". Just remember Rahm Emanuel - don't let a crisis go to waste.  Disclaimer: this is not to say the US should create money whenever it wants without thought. However, the simple fact is it can. For those interested in more, check out Modern Monetary Theory (MMT). Its economic study in a world not based on gold standard, or convertible currency (fiat currency).