There are two kinds of nations, debtor nations and creditor nations.
The creditor nations export more than they import, meaning, obviously, that they produce alot of stuff. Which is what Adam Smith correctly thought is the measure of the Wealth of a nation. And if you own some of their money, you are in good shape, because you can buy a lot of goodies with it. So their currency will be in demand, and go up in price.
A debtor nation may or may not be in good shape. If they are importing and going into debt in order to increase their productive capacity in the future, then they have a [possibly] bright future. But if they are importing and going into debt in order to consume, then that country is destroying its economy.
The USA is now the world’s largest debtor nation. We owe more than anyone else, by far. And that debt has been used to consume. So that we have shot ourselves in the foot very badly, worse than anyone else.
Now one way to pay back your debts is by producing things and giving them to other countries in payment. We obviously are not doing this and don’t plan to do it , as evidenced by a balance of trade deficit of 50 billion dollars a month.
The other way is to print money and use it to pay your debts. This is what we are doing now, more or less, calling it QE2. And it’s what every country in debt has done.
Now somebody who lent money to the USA does not want to be paid back in printed money, because it is worth less than the money he gave. So that if a country is suspected of going to print money, it will not attract people who will lend them money. And we are broke. We need loans [which we are not going to get], or else we have to print lots and lots of money [which will produce hyperinflation] for the govt to be able to spend like the greedy madman it is.
So that we are in the worst shape possible, meaning our dollar will soon not be worth anything. What will people be able to buy with it? Other countries have problems too, but ours are the worst. As soon as enough people figure this out, they will drop the dollar like a hot potato.
GDP measures how much money a country spends. Even if the spending is wasteful [like govt spending], or was borrowed money that was spent ]like govt spending], it all counts for GDP. In other words it’s not an accurate measure of a country’s wealth.