During 'normal times' if the U.S were to raise their base rate to 10% at the very least I would expect to severly puncture the commodity bubble as investors (finally) find a suitable safe home for their investments. This would strengthen the dollar as it becomes an attractive currency and the £ would weaken against it, unless we followed suit.
A lot of third world countries have high interest rates, but it does not mean that people rush in and buy those currencies. And the US does not need to raise rates. Just look at the Petrol price, it has shot up, so that means people have to buy more US$.
Anyways, rates at 10%+ would crush the US economy.
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