The real trouble with this world of ours is not that it is an unreasonable world, nor even that it is a reasonable one. The commonest kind of trouble is that it is nearly reasonable, but not quite. Life is not an illogicality; yet it is a trap for logicians. It looks just a little more mathematical and regular than it is; its exactitude is obvious, but its inexactitude is hidden; its wildness lies in wait.
-GK Chesterton
That by the way, is my favorite quote of all time. Its implications for those investors engaged in various forms of financial engineering are enormous. Models are useful, until they very much are not.
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