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The quantitative aspirations of economists and financial analysts have for many years been based on the belief that it should be possible to build models of economic systems-and financial markets in particular-that are as predictive as those in physics. While this perspective has led to a number of important breakthroughs in economics, "physics envy" has also created a false sense of mathematical precision in some cases. We speculate on the origins of physics envy, and then describe andoi:10.2139/ssrn.1563882 fatcat:spohdimgzfagva6pj4u3gaoaka