The parent mentioned Foreign Exchange. Many people, including non-native speakers, may be unfamiliar with this word. Here is the definition^{(In beta, be kind):}

A transaction that involves the exchange of two currencies. TRADING in foreign exchange is extremely active, with institutions regularly using SPOT and DERIVATIVE contracts to HEDGE, ARBITRAGE, or SPECULATE. See also RATE. [View More]

^{See also: Arbitrage | Hedge | Derivative | Speculate | Spot | Active | Foreign State | Conference Call}

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