a very nice answer, but that was mostly explaining why Saudi sells oil in dollars. My question was why oil based economies like Saudi need to PEG to the dollar.
"China buys US Treasuries with her trade surplus dollars."
What I don't understand is, Chinese exporters are the ones receiving the dollars, not the Chinese government or Chinese central bank. So arent the surplus dollars going to the hands of the Chinese private owners of the export...
"currencies are influenced by a broad set of factors, including central bank policy, interest rates, current account balances and other macroeconomic indicators."
How exactly does each affect prices? What happens step by step?
But since their currency isnt a major one, why would anyone buy it. Take Qatar for example, who would buy it in the world market when the gov't tries to sell it?
When a government raises interest rates, and the money supply in the country increases, does this affect the currency price? Or to affect the supply/demand of the currency price it has to buy/sell it internationally?
"The Interest Rates in Japan are being kept low, serving to keep the value of the Yen low. In general when interest rates are low, the value of the currency is low. When more money is printed it also reduces the value of the currency. Lastly there has been a period of zero inflation in Japan...