In business economics, finance and sports, arbitrage is the concept of taking benefit from a cost difference between two or more markets: striking the variety of matching deals that take advantage upon the imbalances, the profit being the difference within market prices.
When employed by academics, an arbitrage is actually a transaction that concerns no bad cash flow at any probabilistic or temporal state as well as a positive income in one or more state; simply, it is the possibility of a risk-free profit at zero cost.
In principle as well as in academic use, an arbitrage is risk-free; in common use, for example statistical arbitrage, it might mean expected profit, though losses may manifest, and in practice, there are always risks in arbitrage, some minor (such as fluctuation of prices decreasing income), some major (including devaluation of a currency or derivative).
In academic use, an arbitrage involves taking advantage of differences in price of a single asset or identical cash-flows; in common use, it might be used to mean differences between equivalent assets (relative value or convergence trades), such as merger arbitrage.
Individuals who participate in arbitrage are known as arbitrageurs for example a bank or brokerage firm. The word is mainly related to trading in financial instruments, for instance bonds, futures, derivatives, commodities and currencies.
Sports arbitrage has additionally recently become feasible because of the use of online bookmakers giving widely diverging odds on sports producing situations where it is possible to place bets that cannot lose.
Even though this involves bookmakers it’s not at all gambling as there isn’t any risk to the initial stake which can’t be lost. This is known as ‘Arbitrage Betting‘ or ‘Matched Betting‘
Arbitrage just isn’t simply the act of buying a product in a single market and selling it in another for a higher price at some later time. The deals must occur simultaneously to stop exposure to market risk, or the risk that prices may change on a single market before both deals are finished.
In functional terms, this is generally only possible with securities and financial products which can be traded electronically, and even then, when each leg of this trade is completed the prices sold in the market could have moved.
Missing one of the legs from the trade (and subsequently being forced to trade it immediately after at a worse price) is known as ‘execution risk’ or more specifically ‘leg risk’.
“True” arbitrage mandates that there be no market risk involved.