One of the great paradoxes of life is that the smarter one is, the better one realizes just how little one knows. The same thing is true with forecasts: one can hypothesize and conjecture, but if one is unlucky, one is screwed: no matter how thought out, error-proof or logical the narrative - it is the unpredictable events that ultimately shape events, not the "priced in" obvious factors. The Heisenberg Uncertainty Principle applies in a perverse fashion not only to the wave-particle duality in the quantum realm, but to the very underpinning of economics: by predicting the future we implicitly change it. The futility of forecasts is well known to all those, who with the exception of a several few, whose very existence is an economy of scale "strange attractor" (think Warren Buffett and Goldman Sachs), have tried to repeat a winning performance, be it based on fundamentals, technicals, or kangaroo entrails. It is also sufficiently useless to the point where we will spare you a Zero Hedge set of observations of what to expect: if you have been reading this blog, you know what we believe is relevant as we enter 2010. How it will all pan out, however, is a totally different story. It is therefore not too ironic, and somewhat fitting, that Goldman Sachs' chief economists do not leave 2009 with a dogmatic set of forecasts, which, just like every other year would have the success rate of a coin toss, but with 10 key questions addressed exactly one year into the future. Here are Goldman's 10 Questions for December 31, 2010.