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When everyone believes something is risky, their unwillingness to buy usually reduces its price to the point where it’s not risky at all. Broadly negative opinion can make it the least risky thing, since all optimism has been driven out of its price. • And, of course, as demonstrated by the experience of Nifty Fifty investors, when everyone believes something embodies no risk, they usually bid it up to the point where it’s enormously risky. No risk is feared, and thus no reward for risk bearing—no “risk premium”—is demanded or provided. That can make the thing that’s most esteemed the riskiest. This paradox exists because most investors think quality, as opposed to price, is the determinant of whether something’s risky. But high quality assets can be risky, and low quality assets can be safe.
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Howard Marks (The Most Important Thing: Uncommon Sense for the Thoughtful Investor (Columbia Business School Publishing))