Currency Arbitrage

DEFINITION of 'Currency Arbitrage'

A forex strategy in which a currency trader takes advantage of different spreads offered by brokers for a particular currency pair by making trades. Different spreads for a currency pair imply disparities between the bid and ask prices. Currency arbitrage involves buying and selling currency pairs from different brokers to take advantage of this disparity.


For example, two different banks (Bank A and Bank B) offer quotes for the US/EUR currency pair. Bank A sets the rate at 3/2 dollars per euro, and Bank B sets its rate at 4/3 dollars per euro. In currency arbitrage, the trader would take one euro, convert that into dollars with Bank A and then back into euros with Bank B. The end result is that the trader who started with one euro now has 9/8 euro. The trader has made a 1/8 euro profit if trading fees are not taken into account.

BREAKING DOWN 'Currency Arbitrage'

Currency arbitrage involves the exploitation of the differences in quotes rather than movements in the exchange rates of the currencies in the currency pair. Forex traders typically practice two-currency arbitrage, in which the differences between the spreads of two currencies are exploited. Traders can also practice three-currency arbitrage, also known as triangular arbitrage, which is a more complex strategy. Due to the use of computers and high-speed trading systems, large traders often catch differences in currency pair quotes and close the gap quickly.

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