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Efficient Market Hypothesis: R.I.P. Of all the belief systems of Wall Street, few can claim the devoted following of the Efficient Market Hypothesis, the idea that stock prices adhere to the same laws of supply-and-demand that govern retail products. Once coined the theoretical “Parthenon” of economics, this notion has consistently endured the test of time [...] Many banks today also have a shockingly large exposure to leveraged derivatives such as futures, options and even more exotic instruments. The underlying value of assets represented by such financial derivatives at quite a few big banks is greater than the total value of all their deposits. The estimated representative value of all derivatives in the world today is $90 trillion, over half of which is held by U.S. banks. Many banks use derivatives to hedge against investment exposure, but that strategy works only if the speculator on the other side of the trade can pay off if he’s wrong. [...] |
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