Psychological denial
Reality gets rewritten until it's bearable.
When the truth is too painful, the mind constructs a more bearable version. Munger's examples include grief, addiction, and the parents who refuse to accept a child's death. The mechanism is autonomous; the person doesn't choose to deny, the brain does it for them.
In business contexts, denial shows up as founders who refuse to see that a strategy isn't working, executives who refuse to see that a project is going to fail, and entire companies that refuse to see disruption coming.
The defence is uncomfortable. You have to deliberately seek out the unwelcome information and force yourself to sit with it. Pre-mortems, dissenting opinions, outside reviews. These exist mostly to puncture denial. The denial is automatic; the puncturing has to be active.
Examples in the wild
Most struggling startups go through 6-12 months of denial before the founders accept the company isn't working. Those 12 months are often the difference between a survivable wind-down and a personal catastrophe.
Holding losing positions long past the point of rationality is usually denial, not sunk-cost reasoning. The investor isn't honoring sunk costs; they can't yet face the loss as real.
Health denial is endemic. The lump that's been there for six months. The pattern of drinking. The marriage that everyone else can see is failing. Denial costs years.
Psychological denial is one of the mental models we apply through real cases inside the Pareto MBA — a part-time program for professionals who want to think clearly about business.