Trading and Fat Tails
Abstract
Sudden, large price changes periodically occur in speculative markets. Many of these large price moves simply reflect the market’s reaction to new fundamental economic information-- as financial theory would predict. However, some of the most extreme price moves—often characterized (albeit incorrectly) as “Black Swans” in popular parlance--reflect more the predictable behavior of traders in certain situations or poorly designed market microstructures than the arrival of new fundamental information. These trading-induced price moves have important implications for practitioners, policymakers and academics alike.
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