While you're manually checking if YES + NO = 1 , quantitative systems are solving massive constraint satisfaction problems across thousands of correlated markets in milliseconds. The Hidden Reality of Prediction Market Arbitrage You see a market where YES is trading at 0.62andNOat0.62 and NO at 0.33. You think: There's $0.05 of arbitrage here . You're right. What you don't see is that by the time you place both orders, professional systems have already: Scanned 17,000+ conditions Detected dozens of corre