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In economics, a speculative attack is a precipitous selling of untrustworthy assets by previously inactive speculators and the corresponding acquisition of some valuable assets (currencies, gold). The first model of a speculative attack was contained in a 1975 discussion paper on the gold market by Stephen Salant and Dale Henderson at the Federal Reserve Board. Paul Krugman, who visited the Board as a graduate student intern, soon adapted their mechanism to explain speculative attacks in the foreign exchange market.
There are now many hundreds of journal articles on financial speculative attacks, which are typically grouped into three categories: first, second, and third generation models. Salant has continued to explore real speculative attacks in a series of six articles.