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As an example, the US feds controlling base interest rates can, to a certain extent, steer economic activity. However, as we can see, it is doing nothing, currently (some argue that it'd be worse without it - but that just demonstrates ignorance). So, an economic rudder goes from a clear controller to completely and utterly broken.
At the end of the day, we are dealing with people, who, ultimately, are irrational. No matter how smart, well intentioned, or influential, there's no getting away from the Furby effect.
Yes and No. Certainly people are an unpredictable element and the markets don't always behave as we expect them to. Indeed it was mostly the conceipt of bankers who felt they could reliably predict the markets (or actually computer programmers who thought they could build models which would do that) that led us into this state in the first place. It was started by corruption in the US martgage market, furthered by the UK's "I can predict anything" money market culture and then exopsed teh underlying problems that the eurozone has been hiding for the last two decades. The whole thing has been a perfect storm.