THE REFERENCE LIBRARY
A growing collection of ideas for understanding the world — and your own thinking.
A perspective is limited by what a person can observe, attend to, and already knows. Other viewpoints can reveal missing information when their evidence is examined and compared.
When faced with a difficult question, people often unconsciously substitute an easier related question and answer that instead. This heuristic can provide quick, adequate answers but sometimes leads to systematic errors.
When a question is difficult, we may answer an easier one without noticing: how much a person resembles a stereotype instead of how likely an outcome is, or how easily an event comes to mind instead of how often it happens. This substitution can produce systematic errors and, when people use different cues, inconsistent judgments.
Subtext is the underlying meaning in art or communication that is implied rather than directly stated, allowing for richer interpretation and engagement.
Taleb argues for via negativa: improving a situation by removing harmful additions. He applies the idea to medical intervention, food, and personal irritants, combining speculative health claims with examples of changes he has made in his own life.
Knowledge grows more by subtracting errors than by adding facts; negative knowledge (what is wrong) is more robust than positive knowledge, as disconfirmation is more rigorous than confirmation.
A fallacy where one attempts to explain a phenomenon that does not actually occur or lacks evidence, often presupposing its existence and thus begging the question.
Success can conceal mistakes and encourage people to treat warning signs as normal. Varol uses NASA’s Challenger and Columbia disasters to argue for examining near misses, reviewing decisions with the information available at the time, and continuing to question successful practices.
Continuous self-education and rationality are moral duties that lead to success. Being a 'learning machine' who acquires wisdom daily is more important than innate intelligence or diligence.
Two activities compete for limited support or resources. The more successful one becomes, the more support it gains, thereby starving the other.
This martial passage emphasizes denying an opponent the initiative through preparation, attention, and practiced response. It links effective action with sustained commitment to training.
This framework organizes the evaluation of norms and standards into guidelines, conduct, and outcomes. It asks how evidence will be gathered, assessed, and checked for usefulness, credibility, independence, and impartiality.
The sunk cost fallacy occurs when people allow unrecoverable investments (money, time, effort) to influence their current decisions, leading them to continue with failing endeavors to justify past costs, rather than making rational choices based on future prospects.
The sunk cost fallacy is the tendency to continue a course of action because of past investments (time, money, effort) that cannot be recovered, even when abandoning it would be more rational. It leads to irrational decision-making where individuals throw good money after bad to justify prior losses.
The tendency to continue investing in a failing endeavor because of the resources already committed, rather than cutting losses and reallocating resources to better alternatives.
The sunk cost principle states that only future costs and benefits should influence decisions, not past irrecoverable expenses. Opportunity cost is the value of the best alternative foregone when a choice is made, and ignoring it can lead to suboptimal outcomes.
The sunk-cost fallacy is continuing because of resources already spent and unrecoverable, rather than comparing the future costs and benefits of continuing with those of stopping.
Julia Galef describes Philip Tetlock’s research on forecasting and a group of unusually successful forecasters. She presents their willingness to recognize errors and revise beliefs as a practice worth learning.
Actuarial methods combine information using explicit rules, which makes their judgments more consistent than unaided impressions. The passage reviews how unreliable feedback, hindsight bias and mistaken beliefs about predictors can hinder clinical judgment. Statistical rules also need validation in the populations and settings where they are used; consistency alone does not ensure accuracy.
Superstitions arise from the memorability of psychologically painful sequences, such as when good data turn bad, leading to erroneous beliefs. The concept also involves anticipatory regret, as seen in behaviors like blackjack players standing at 16 due to fear of a bad outcome.
Counterfactual thoughts ('if only' thoughts) can encourage superstitious beliefs through two mechanisms: memory distortion (making mutable events more available and subjectively probable) and anticipated regret (avoiding actions that could lead to more painful regret).
Supply and demand help explain how prices and quantities respond to shortages, changing preferences, and new production. Prices can also influence who receives a scarce good and whether producers invest in more capacity.
Supply and demand can offer an analogy for dating: preferences, available partners, and perceived scarcity can influence choices. This account extends that analogy into claims about age, gender, and the history of marriage. Those claims depend on untested assumptions about a common scale of partner value and should be distinguished from established economic relationships.
Businesses are linked through supply networks whose costs and consequences extend beyond any one organization. Senge describes the Sustainable Food Lab as an effort to help companies, farmers, governments, and NGOs understand those connections together, then test changes across the food system.
Having a support system of friends, family, colleagues, or online groups can help you express emotions, gain new perspectives, and find solutions to problems.
Support theory is a framework for understanding probability judgments that emphasizes description-dependence and the balance of evidence. It applies to decision making, calibration, and phenomena like the above-average effect.
Support theory explains how the unpacking of a hypothesis into its components increases its judged probability, and its extensions provide models for the calibration of subjective probabilities and for belief-based decision making under uncertainty.
Support theory models how an event’s description affects its judged probability. Listing possibilities separately can draw attention to outcomes people overlook when they assess a broad category, so equivalent descriptions can receive different probability estimates.
Support theory models probability judgments as responses to descriptions of events. Listing an event’s components can increase its judged probability, while listing alternatives can reduce it. Extensions examine why a combined description may receive less support than its separately assessed parts, including repacking and anchoring as possible mechanisms.
People often rate themselves above an average peer. Support theory suggests that the comparison draws on more evidence about oneself than about a vaguely defined group. Naming a specific peer, changing the direction of comparison, or defining the trait more clearly can alter the judgment; motivation may also shape which evidence comes to mind.
This study examined how judged probability of guilt relates to assessed suspiciousness in criminal cases, finding that a suspect twice as suspicious is judged less than twice as likely to be guilty, indicating a sublinear mapping from support to probability.
The Suppressed Correlative fallacy occurs when one redefines a correlative term so that one of the mutually exclusive options becomes impossible, rendering the term meaningless.
The fallacy of suppressed evidence occurs when relevant evidence that would weaken or disprove a conclusion is intentionally omitted, often used in advertising, political rhetoric, and conspiracy theories to mislead.
Possessions, relationships, commitments, and beliefs all create demands on your attention. Surface area is a metaphor for that exposure: reducing it can ease maintenance, while expanding it can bring useful connections and ideas.
A mental model that applies fluid dynamics concepts of viscosity and surface tension to information flow in social and political systems. High viscosity for true information and low viscosity for false information can lead to catastrophic failures, as seen in the Chernobyl disaster.
Taleb argues that, when a profession reliably tests performance, sustained success despite an unpolished appearance can reveal ability that credentials and presentation miss. His heuristic depends on that selection process; looking unlike an expert is not itself evidence of competence.
Surprise indicates that our expectations have been violated in a significant way, serving as a cognitive signal to reconsider our initial assumptions and seek additional context.
To make a logical, unemotional person (a 'Blue') uncomfortable and avoid you, expose them to overly emotional people, as they find sentimentality unpleasant.
Erikson compares behavior patterns to tools: a way of acting can suit one situation and be poorly suited to another. He argues that recognizing differences can help when categories are used carefully.
A winner selected from many random attempts may have an impressive record without repeatable skill. Taleb’s monkey example asks whether the selection process, including unseen failures, supports a prediction of future success.
Survivorship bias occurs when a sample includes only people or things that passed a selection process, omitting those that failed or disappeared. Conclusions drawn from that sample may misstate success rates, risks, or the traits associated with success. Abraham Wald’s analysis of damage to returning warplanes illustrates why missing cases matter.
This chapter discusses survivorship bias and related concepts such as data mining, overfitting, and regression to the mean, emphasizing that in fields with high randomness like finance, track records are often due to luck rather than skill. It contrasts this with professions like dentistry or music where randomness is low and past performance is a reliable indicator of competence.
Survivorship bias occurs when we focus on the successful outcomes (e.g., companies that show earnings increases) while ignoring the many failures, leading to overestimating the probability of success. This cognitive bias distorts our perception of skill versus randomness.
Even a population composed entirely of incompetent managers will produce a small number with great track records due to randomness. This makes it difficult to distinguish skill from luck based solely on past performance.
Suspended judgement is a lateral thinking technique where evaluation of ideas is deferred to allow provocative arrangements of information that may initially be invalid but lead to valid insights. It contrasts with vertical thinking's need to be correct at every step, emphasizing effectiveness over immediate correctness.
Suspended judgement is a key principle in brainstorming where no evaluation of ideas is allowed during the session. It encourages free expression of ideas without fear of criticism, allowing even seemingly ridiculous suggestions to be put forward.
Sustainable results require shifting focus from short-term fixes to building systems that enable people to solve problems themselves, avoiding dependency on external intervention and the reinforcement of personal power.
Root cause analysis alone is insufficient; sustaining improvement requires ongoing behavioral change, coaching, and imaginative efforts to maintain discipline and interest over time.
The Swampman thought experiment, invented by Donald Davidson, attempts to isolate the role of history in meaning and thought by imagining a perfect replica with no causal history. However, such extreme intuition pumps, like a cow giving birth to a shark, are criticized because they depart too far from reality and rely on intuitions that are hard to control, making them unilluminating.
Taleb argues that a high tax share can obscure how Nordic governments distribute power. In his account, local control over spending and room for private economic activity complicate the picture of a large centralized state.
Sweeping statements are overly broad claims that can be made more precise and defensible by refining their scope with qualifiers such as 'almost all', 'in my experience', or 'in my opinion'. Carefully qualified statements reduce ambiguity and help avoid logical disagreements.
The swimmer's body illusion occurs when people mistake selection for an effect of an activity. Elite swimmers may have physical traits that helped them reach that level, so their appearance alone does not show what swimming will do for everyone. A related selection effect can make long-term gamblers remember unusually lucky beginnings.
The Swiss cheese model explains how multiple layers of defense (like safety measures) can fail when their 'holes' align, allowing a hazard to cause a catastrophic outcome. It emphasizes that doing many good things does not prevent disaster if critical weaknesses are not addressed.
Switching costs are the money, time, effort and disruption involved in changing products or technologies. Compatibility, learned routines, data and integrations can make an established system costly to leave, especially when many other users depend on it.
Switching costs are the monetary, psychological, effort, and time expenses consumers face when changing products, suppliers, or brands, often used by companies to discourage change.
SWOT organizes an assessment into Strengths, Weaknesses, Opportunities, and Threats. Use the categories to clarify a project’s position, then decide which issues call for action. The book traces its origin to a study from the 1960s.
In sympathetic magical thinking, contagion treats contact as transferring an enduring essence, while similarity treats resemblance as evidence of shared properties or powers. These beliefs can shape feelings about objects even when no physical effect is established.
Solutions that address only symptoms provide short-term relief but can undermine the ability to solve root causes, leading to recurring problems and atrophy of fundamental solution capabilities.
Research synthesis must fit the decision’s deadline as well as its evidence needs. Banasiewicz’s 3E framework proposes that organizations build on existing research summaries, then assess how well those findings apply to the specific decision.
System 1 is fast, automatic, and intuitive; System 2 is slow, deliberate, and analytical. Their interaction governs many judgments and decisions, with System 1 often generating intuitive responses that System 2 may endorse or override, leading to both accurate judgments and systematic errors.