Triangular arbitrage opportunities can be easily identified using bid and ask quotes. In this article I describe formulas for computing triangular arbitrage using bid and ask quotes. It is worth noting that the triangular arbitrage computation using bid and ask prices is a bit more complex than simply using close prices.
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Triangular arbitrage involves placing offsetting transactions in three forex currencies to exploit a market inefficiency for a theoretical risk free trade. In practice, there is substantial execution risk in employing a triangular arbitrage or tri arb strategy which may make it difficult to profit for retail traders. However, a knowledge of triangular arbitrage mechanics can enable forex traders to understand better how market prices self-regulate.
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