En economía y finanzas, arbitraje es la práctica de tomar ventaja de una diferencia de precio entre dos o más mercados: realizar una combinación de transacciones complementarias que capitalizan el desequilibrio de precios. La utilidad se logra debido a la diferencia de precios de los mercados. Por medio de arbitraje, los participantes en el mercado pueden lograr una utilidad instantánea libre de riesgo. La persona que ejecuta el arbitraje se conoce como arbitrajista, y es usualmente un banco o una firma de inversión. El término es comúnmente aplicado a las transacciones de instrumentos financieros, como bonos, acciones, derivados financieros, mercancías y monedas. Si los precios de mercado no permiten la ejecución de arbitraje rentable, se dice que los precios constituyen un equilibrio de arbitraje, o un mercado libre de arbitraje. El equilibrio de arbitraje es una precondición para un equilibrio económico general.

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In economics and finance, arbitrage (US /ˈɑːrbᵻtrɑːʒ/, UK /ˈɑːbᵻtrɪdʒ/, UK /ˌɑːbᵻtrˈɑːʒ/) is the practice of taking advantage of a price difference between two or more markets: striking a combination of matching deals that capitalize upon the imbalance, the profit being the difference between the market prices. When used by academics, an arbitrage is an (imagined, hypothetical, thought experiment), transaction that involves no negative cash flow at any probabilistic or temporal state and a positive cash flow in at least one state; in simple terms, it is the possibility of a risk-free profit after transaction costs. For instance, an arbitrage is present when there is the opportunity to instantaneously buy low and sell high. In principle and in academic use, an arbitrage is risk-free; in common use, as in statistical arbitrage, it may refer to expected profit, though losses may occur, and in practice, there are always in arbitrage, some minor (such as fluctuation of prices decreasing profit margins), some major (such as 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 is also used to refer to differences between similar assets (relative value or convergence trades), as in merger arbitrage. People who engage in arbitrage are called arbitrageurs /ˌɑːrbᵻtrɑːˈʒɜːr/—such as a bank or brokerage firm. The term is mainly applied to trading in financial instruments, such as bonds, stocks, derivatives, commodities and currencies.

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