First conclusions become nearly permanent — the brain resists its own updates

Munger describes Inconsistency-Avoidance Tendency as the brain’s anti-change mode: “the human mind works a lot like the human egg — when one sperm gets into a human egg, there’s an automatic shut-off device that bars any other sperm from getting in.” Once a conclusion is in place, the brain actively resists updating it. This applies to habits (Marley’s ghost: “chains of habit that were too light to be felt before they became too strong to be broken”), professional beliefs, political loyalties, and even scientific paradigms. Max Planck observed that “even in physics the radically new ideas are seldom really accepted by the old guard” — progress comes from new generations less brain-blocked by previous conclusions.

The antidotes are deliberate structural interventions: courts require hearing “long and skillful presentations of evidence and argument from the side they will not naturally favor.” Franklin’s “ounce of prevention is worth a pound of cure” applies directly — it’s far easier to prevent a bad habit or conclusion from forming than to dislodge one that’s taken root. This connects to Evolving summaries beat append-only memory — rewrite profiles, don't accumulate facts — agent memory systems face the same challenge of overwriting outdated conclusions rather than just accumulating new facts alongside old ones. For any decision-making system, the implication is clear: front-load the formation of correct mental models, because changing them later is fighting the brain’s deepest programming. Clay’s principle of Non-attached action enables clearer course correction — detach from outcomes to see reality is a direct structural defense — by cultivating non-attachment to outcomes and ideas, you weaken the lock-in effect before it takes hold. This lock-in effect is amplified when Small concessions trigger disproportionate reciprocation — even at the subconscious level — an initial small commitment, once made, activates Inconsistency-Avoidance to maintain the trajectory, making the concession-escalation sequence nearly irreversible.