Macroeconomics - the study of the economy works as a whole, is extremely faddish. Every 20 years or so, it reinvents itself and comes up with a whole new way of analysing things.
Almost inevitably, this follows a period when the last model of the world has worked pretty well, and then stopped working due to either old age or just somethat that noone foresaw.
I think we're at that point at the moment. The Bank of England, for example, is likely to remain independent but I'd bet good money that in 5 years time it's not going to have an interest-rate only target. Until the macroeconomists work out the next "right" way of approaching things (or at least something that will work for 15 years or so), I think there will be quite a bit of uncertainty in the market.
Basically, I think we're at the point where a lot of economists start getting inventive. Let's hope it doesn't take macro and monetary economics long to come up with a story convincing enough to make those that actually do business more comfortable :-)