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What is the cause of sudden price spikes in the FOREX market?
Forex is really not that volatile compared to other major asset classes like stocks and commodities. But still markets are generally unencumbered in the major pairs and therefore spikes in volatility can happen. Take what happened with the Swiss Franc a few years ago for example, or GBPUSD recently with news of Brexit. This is less the case with highly regulated currencies like the Chinese Yuan (CNY) Volatility is caused by excessive buy or sell pressure in relation to the available liquidity at the current price. This is usually caused by large buy or sell orders placed with interbank desks by institutions (often including other banks) and central banks. News can also sometimes have a dramatic impact and cause traders to adjust their prices significantly and very quickly.