An AI program that uses a knowledge base of human-expert rules to make decisions. Expert systems simulate expert judgment in a domain by applying “if-then” rules. In algorithmic trading, early forex robots were essentially expert systems: programmers encoded trading heuristics (e.g. if RSI > 70 then sell) into rule sets. Though modern AI often goes beyond fixed rules, the concept persists in strategy development; for example, many EAs (Expert Advisors) use rule-based logic on technical indicators to open or close trades.

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