Psychology & Behavior

We judge the likelihood of events based on how easily examples come to mind, not on actual frequency. Dramatic, recent, or emotionally vivid events get massively overweighted.

The first piece of information encountered disproportionately influences all subsequent judgements — even when the anchor is arbitrary or irrelevant.

People adopt beliefs, behaviours, and trends simply because others have — popularity becomes self-reinforcing regardless of underlying merit.

The more people present during an emergency, the less likely any individual is to act — diffusion of responsibility paralyses groups.

When beliefs and actions contradict, the resulting psychological discomfort drives people to rationalise rather than change — protecting the ego at the cost of truth.

The tendency to seek, interpret, and remember information that confirms existing beliefs while ignoring contradictory evidence.

Once you know something, you cannot imagine what it is like not to know it — creating systematic blind spots in communication, product design, and leadership.

The quality of decisions deteriorates after sustained decision-making — willpower is finite and every choice depletes the same cognitive resource.

People with low competence overestimate their abilities while experts underestimate theirs — the less you know, the less you know you don't know.

People overvalue things they own relative to identical things they don't — ownership itself inflates perceived worth.

Identical information presented differently leads to opposite decisions — how you frame the question determines the answer you get.

People attribute others behaviour to character rather than circumstances — overweighting disposition and underweighting situation.

Cohesive groups suppress dissent, overestimate invulnerability, and converge on catastrophically flawed decisions — consensus replaces critical thinking.

A single positive trait — appearance, charisma, early success — colours evaluation of all other traits, creating systematic overestimation.

After an event, people believe they predicted it — the knew-it-all-along effect destroys the ability to learn from mistakes by rewriting the past.

People overvalue things they helped create — the labour invested inflates perceived worth regardless of objective quality.

People with incentives to believe something will find ways to believe it — incentive structures shape behaviour more reliably than values, culture, or stated intentions.

When multiple psychological tendencies combine simultaneously in the same direction, the compound effect is far more powerful than any single bias — producing extreme, often irrational outcomes.

Losses feel approximately twice as painful as equivalent gains feel pleasurable, distorting risk assessment and decision-making across every domain.

Our tendency to construct stories that explain events after the fact, creating an illusion of understanding and predictability where randomness and complexity actually dominate.

People judge experiences not by the total or average but by the most intense moment and how it ends — design the peak and the ending, and the memory takes care of itself.

People systematically underestimate time, cost, and risk while overestimating benefits — even when they have past experience proving them wrong.

A belief, once held, alters behaviour in ways that make the belief come true — expectations create their own reality.

When uncertain, people look to what others are doing — in the digital age, this shortcut dominates every purchase, hire, and investment decision.

People disproportionately prefer the current state of affairs — loss aversion applied to change itself makes inaction the default choice.

Continuing a behaviour because of previously invested resources that cannot be recovered.

Studying only the survivors produces systematically wrong conclusions — the dead tell no tales, but their silence is the data that matters most.

Chesterton's Fence is the principle that you should never remove a rule, process, or institution until you understand why it was put there in the first place. G.K. Chesterton argued that a fence across a road exists for a reason — and the person who doesn't see the reason is exactly the person who shouldn't be allowed to remove it. In business and engineering, this mental model prevents well-intentioned reformers from breaking systems they don't fully understand. Before dismantling anything — a policy, a codebase pattern, a team ritual — first understand the problem it was solving. The fence may be ugly, but it might be the only thing between you and a stampede.

Named after Admiral James Stockdale, the highest-ranking U.S. military officer held as a prisoner of war in Vietnam. The paradox: you must maintain unwavering faith that you will prevail in the end, while simultaneously confronting the most brutal facts of your current reality. The leaders who survived were not the optimists — they were the realists who never lost faith.