Some automated programs with complicated algorithms that watch market prices, movements and volumes of trading also monitor media outputs.
The Financial Times (FT) newspaper reported that the crash happened almost at the same time as it published a story about French President Francois Hollande noting there might be a "hard Brexit" for Britain as it left the EU.
The FT also reported that the flash fall may have been due to human error, or to stop-loss orders, automatic instructions to sell once a certain level is reached.
Friday is also the day in the trading cycle when some foreign exchange options expire, which can cause uNPRedictable movements in exchange rates.
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2020-09-15
2020-09-15
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