Biases don't add, they multiply — several small pressures acting together produce outcomes none would produce alone.
This is the part of the psychology talk that has aged best. The individual items on the checklist are folk taxonomy and several failed replication; the claim that they compound has held up.
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extends →Ego, emotion, social pressure, and inertia hijack a decision before reasoning ever starts.Parrish enumerates the hijackers one at a time. Munger’s contribution is structural: it is the confluence that does the damage, which is why single-bias debiasing so rarely helps.