Depends what your current situation is. There are services that will help. If it's really bad and you're going to need more soon, that's really the best thing, though you might expect to pay a thousand bucks or so. Generally, pay everything on time going forward and try to have a lot of credit but don't use much of it. What services can do is help with specific advice and handle any past delinquencies (challenging stuff that might not be legit and dealing with stuff that is, which might mean some kind of consideration in return for payment).
1. I'm not 100% clear on the question. Are you asking why, for example, the U.S. gov't can't just say that we want USD to be worth X% of CNY?
2. Theoretically, I guess any country can manipulate its currency value. Not necessarily desirable, though. Remember when Romney said he'd "declare China a currency manipulator"? The effect of that is to start negotiations (FYI, such negotiations were already ongoing when he said that, though they weren't kicked off through that declaration; and Trump also said it but it no longer applied by then). Basically, if we believe that a country is manipulating currency, we ask them to knock it off. If they really need us and we don't need them, our ask can be pretty effective (and then it never gets to that point). If not, it might not be.
3. Man, that's tough. That was truly a bad thing for American workers, though (great for Chinese workers). And only moderated balanced by the good it did for the American consumer. No telling the impact of the ripples. I owe
@HomerThompson a deeper look at the causes of wage stagnation, but IMO, that was the biggest factor in the stagnation since it happened (Dec. 2001). Here's median weekly earnings for full-time workers since:
You can probably guess why it rose when the GFC hit and then started falling, then rose again. But the general decline from 2002-2007 is what I'm talking about.
