It all seems so obvious: investors rarely maintain objective, rational, neutral and stable positions. First they exhibit high levels of optimism, greed, risk tolerance and credulousness, and their resulting behavior causes asset prices to rise, potential returns to fall, and risk to increase. But then, for some reason—perhaps the arrival of a tipping point—they switch to pessimism, fear, risk aversion and skepticism, and this causes asset prices to fall, prospective returns to rise, and risk to decrease. Notably, each group of phenomena tends to happen in unison, and the swing from one to the
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