In business economics, investment and sports, arbitrage  is the concept of taking advantage of a price difference between several markets: striking the variety of matching deals that capitalize upon the difference, the profit being the difference within the market prices.

When used by academics, an arbitrage is usually a transaction that involves no damaging cashflow at any probabilistic or temporal state along with a positive cashflow in a minimum of one state; essentially, it’s the chance of a risk-free profit at zero cost.

In principle and in academic use, an arbitrage is risk-free; in common use, as in statistical arbitrage, it could mean expected profit, though losses may occur, and in practice, there are always risks in arbitrage, some minor (along the lines of fluctuation of prices decreasing income), some major (for example devaluation of the currency or derivative).

In academic use, an arbitrage involves benefiting from differences in price of a single asset or identical cash-flows; in common use, it is usually employed to mean differences between similar assets (relative value or convergence trades), for example merger arbitrage.

Individuals that take part in arbitrage are known as arbitrageurs for example a bank or brokerage firm. The phrase is primarily given to trading in financial instruments, such as bonds, stocks, derivatives, products and currencies.

Specific sport arbitrage has additionally recently become practical due to the availability of world-wide-web bookmakers giving widely diverging odds on sporting events creating situations where you’re able to place bets that cannot lose.

Despite the fact that this involves bookmakers it isn’t gambling as there is absolutely no risk to the initial stake which can not be lost. This is whats called ‘Arbitrage Betting‘ or ‘Matched Betting‘

Arbitrage just isn’t simply the act of purchasing a product in one market and selling it in another for a better price at some later time. The deals must occur simultaneously to prevent exposure to market risk, or the risk that prices may change on a single market before both trades are finished.

In realistic terms, this is generally only possible with securities and financial products that may be traded electronically, and even then, when each leg of the trade is accomplished the values in the market could possibly have moved.

Missing one of the legs from the trade (and subsequently having to trade it soon after at a worse price) is known as ‘execution risk’ or more specifically ‘leg risk’.

“True” arbitrage necessitates that there be no market risk concerned.