Key Takeaways
- Currency arbitrage exploits price discrepancies between brokers’ quotes in forex markets, often using high-speed computer systems.
- Key types include two-currency arbitrage, which is common, and three-currency or triangular arbitrage, which is more complex.
- Execution risk due to the rapid pace of forex markets is a significant concern for arbitrage traders.
- Arbitrage opportunities are fleeting, and technological advances have decreased their frequency.
Get personalized, AI-powered answers built on 27+ years of trusted expertise.
What Is Currency Arbitrage?
Currency arbitrage involves the simultaneous purchase and sale of a currency pair to exploit price differences in quotes. Traders watch for spread differences and move quickly to take advantage of opportunities for profit.
Two-currency arbitrage is the most common, but a more complex three-currency arbitrage is also employed. The enormous speed of electronic and algorithmic trading has made currency arbitrage less viable for many traders because the gap between price quotes closes so quickly.
How Currency Arbitrage Works
The use of computers and high-speed trading systems make currency arbitrage possible, but also make it a high-speed game. Large traders watch for differences in currency pair quotes and close the gap quickly.
Currency arbitrage exploits differences in quotes, not actual movements in currency pair exchange rates.
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.
The most important risk that forex traders must deal with while arbitraging currencies is execution risk. The risk is that that the desired currency quote may be lost due to the fast-moving nature of forex markets.
Illegal in India
Arbitrage trading is legal in most countries, including the U.S. In India, it’s illegal during market hours, meaning traders can’t buy and sell the same stock on two exchanges the same day.
Demonstrating Currency Arbitrage with an Example
For example, two banks, Bank A and Bank B, provide quotes to exchange U.S. dollars for euros, the US/EUR currency pair in forex.
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 and convert it into dollars with Bank A and then back into euros with Bank B.
The result is that the trader who started with one euro now has 9/8 euros. The trader has made a 1/8 euro profit if no trading fees are taken into account.
Risks in Currency Arbitrage
Currency arbitrage is considered to be risk-free. That is, if the two trades occur simultaneously, there is no possibility of the prices changing.
Due to online portals and algorithmic trading, arbitrage is now less common. Opportunities to act on price discrepancies vanish quickly.
What Types of Arbitrage Trading Are There?
Arbitrage trading is conducted in the stock market and the commodities markets as well as the forex. In each case, arbitrage trading involves simultaneously buying and selling the same asset on different exchanges to profit from the tiny and short-lived differences in their market prices.
Most arbitrage trading is done by institutional traders and in huge quantities.
What Is Merger Arbitrage?
Merger arbitrage is different from arbitrage trading. Merger arbitrage involves buying shares of companies that are about to merge to profit from the differences in their prices immediately before and after the merger goes through.
What Is Risk Arbitrage?
Pure arbitrage is considered virtually risk-free. The trader is buying and selling two assets simultaneously at the prices that are being offered.
Risk arbitrage, as the name makes clear, is not a sure thing. A trader may, for example, buy shares of a company that is in the midst of a takeover for a certain price that is below the announced takeover price. The trader will buy the shares to flip them as soon as the takeover is finalized at the higher price. The risk is that the deal will fall through.
The Bottom Line
Arbitrage trading, especially in currencies, relies on global financial markets. Traders engage in currency arbitrage to take advantage of tiny discrepancies in the pricing of currency pairs to book a profit.
Technological advances and greater market efficiency have reduced the frequency and ease of currency arbitrage because price discrepancies disappear so quickly. But institutional traders using sophisticated algorithms are still able to pinpoint and exploit these small price differences to make money.
