The overall stock markets currently represent more than thirty trillion dollars, but a single order in 2008, only fifty billion, that is, less than two-tenths of a percent of the total, triggered a drop of close to 10 percent, causing losses of around three trillion dollars. As retold in Antifragile, it was an order activated by the Parisian bank Société Générale, which discovered a hidden acquisition by a rogue trader and wanted to reverse the purchase. Why did the market react so disproportionately? Because the order was one-way—stubborn: they had to sell and there was no way to convince the
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