Slow, deliberate, effortful analytical reasoning — logical processing that can override System 1 impulses but is cognitively expensive and easily fatigued.
Deeper Explanation
System 2 is what investors engage when they build a DCF model, run through an investment checklist, or deliberately seek disconfirming evidence. It is the mode required for sound investment analysis — but it is also lazy: the brain defaults to System 1 whenever possible because analytical processing requires significant cognitive resources. Decision fatigue is real: System 2 quality deteriorates after sustained analytical effort, which is why important investment decisions should be made at the beginning of the day with fresh cognitive resources, not at the end of a long day of market watching. Pre-commitment devices (written checklists, written theses, pre-set stop-loss levels) encode System 2 judgments made when cognition is fresh.
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