Time to see models and shocks for what they are

Market shocks are earthquakes, not a game of roulette

david-rowe

Some events elicit very revealing reactions. One such was the mid-January surge in the Swiss franc exchange rate versus the euro. It followed the decision by the Swiss central bank to abandon the pegged rate it had maintained since 2011. Some will recall a comment in August 2007 by David Viniar – then chief financial officer of Goldman Sachs – that one of the bank's funds had fallen victim to the impact of "25-standard deviation events several days in a row". Clearly the urge for self

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