Lucas Evans

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What is statistical arbitrage in forex?

Statistical arbitrage (stat arb) exploits short-term mispricings between correlated instruments using quantitative models. For example, if EUR/USD and GBP/USD historically move together but temporarily diverge, a trader might short the stronger and long the weaker, expecting reversion. Institutions run complex multi-pair models, often with high-frequency execution. The edge lies in probability rather than individual trades, requiring large volumes and small margins. Risks include correlation breakdowns and sudden macro shifts that invalidate historical patterns. For retail traders, simplified versions exist through pair trading, but execution speed and data quality remain critical. Stat arb is highly technical but reflects how professionals turn statistics into consistent profits.