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In economics, arbitrage is the practice of taking advantage of a state of imbalance between two (or possibly more) markets: a combination of matching deals are struck that exploit the imbalance, the profit being the difference between the market prices. A person who engages in arbitrage is called an arbitrageur.

For example, if you can buy items at one price at a factory outlet[?] and sell them for a higher price on an internet auction website such as eBay, you can exploit the imbalance between those two markets for those items. The term "arbitrage", however, is usually applied only to trading in money and investment instruments (such as stocks, bonds, and other securities), not to goods, and the difference in prices is usually referred to as "the spread", so arbitrage is often defined as "playing the spread" in the money market.

Arbitrage has the effect of causing prices in different markets to converge. As a result of arbitrage, the currency exchange rates, the price of commodities, and the price of securities in different markets all tend to converge to a fixed price. The speed at which the prices converge is one measure of the efficiency of a market.

Examples Here's a theoretical example: Suppose that the exchange rates (after taking out the fees for making the exchange) in London are 5 = $10 = 1000 and the exchange rates in Tokyo are 1000 = 6 = $10. Converting $10 to 6 in Tokyo and converting that 6 into $12 in London, for a profit of $2, would be arbitrage.

One real-life example of arbitrage involves the stock market in New York and the futures market in Chicago. When the price of a stock in New York and its corresponding future in Chicago are out of sync, one can buy the less expensive one and sell the more expensive. Because the differences between the prices are likely to be small (and not to last very long), this can only be done profitably with computers examining a large number of prices and automatically exercising a trade when the prices are far enough out of balance. The activity of other arbitrageurs can make this risky. Those with the fastest computers and the smartest mathematicians take advantage of series of small differentials that would not be profitable if taken individually.

Risks Arbitrage is subject to a number of risks which become magnified when leverage or borrowed money is used. It can be problematic if prices shift adversely during the execution of trades. Another risk occurs if the items being bought and sold are not identical and the arbitrage is conducted under the assumption that the prices of the items are correlated or predictable.

Long-Term Capital Management lost $100 billion mis-managing this concept in September 1998. LTCM had attempted to make money on the difference between different bond instruments. For example, it would buy U.S treasury bonds[?] and sell Italian bond futures. The concept was that because Italian bond futures had a less liquid market, in the short term Italian bond futures would have a higher return than U.S. bonds, but in the long term, the prices would converge. Because the difference was small, large amount of money had to be borrowed to make the buying and selling profitable.

The downfall in this system began on August 17, 1998, when Russia defaulted on its rouble debt and domestic dollar debt. Since the markets were already nervous due to the Asian crisis[?], investors began selling non-U.S. treasury debt and buying U.S. treasuries, which were considered a safe investment. As a result the return on U.S. treasuries began decreasing because there were many buyers, and the return on other bonds began to increase because there were many sellers. This caused the difference between the returns of U.S. treasuries and other bonds to increase, rather than to decrease as LTCM was expecting. Eventually this caused LTCM to fold, and a bailout had to be arranged to prevent a collapse in confidence in the economic system.

An ironic footnote is that they were right long-term (the LT in LTCM), and a few months after they folded their portfolio became very profitable. However the long-term does not matter if you cannot survive the short-term, and that they failed to do.

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