Latest posts
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What Is the Spotlight Effect?
You arrive to a meeting 5 minutes late. You feel everyone is watching and judging. In reality, they barely noticed. They’re focused on the meeting content. The Original Discovery Gilovich’s study (1999). He had students wear embarrassing T-shirts in public, predicting others would notice. In reality, only 23% of passersby noticed the shirt. Students estimated…
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What Is the IKEA Effect?
You build a bookshelf (IKEA) yourself. It’s wobbly and poorly finished. You love it and take great care of it. A professionally-made bookshelf of the same quality feels cheap and disposable. The Original Discovery Kahneman and Norton’s study (2011). They had people assemble IKEA furniture or origami. Those who assembled rated their creations significantly higher…
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What Is Gambler’s Fallacy?
A lottery hasn’t hit the number 7 in 100 draws. Someone bets heavily on 7, thinking it’s ‘overdue.’ The probability is still 1 in (whatever), but the bias makes it feel like 7 ‘should’ come soon. The Original Discovery Observed in Monte Carlo, 1913, when roulette landed on black 26 times in a row. Gamblers…
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What Is the Peak-End Rule?
A colonoscopy procedure (Group A): 20 minutes of pain, ends with 3 minutes of extra pain. (Group B): same 20 minutes, but 3 minutes more of mild pain. Group A rates the experience better because it ends more unpleasantly. The Original Discovery Daniel Kahneman’s research (1993). He had subjects put hands in cold water. Group…
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What Is Blind Following Effect?
A manager implements a new process. Teams follow it without questioning. Later, it’s discovered the process is inefficient, but by then it’s established as ‘how we do things.’ The Original Discovery Demonstrated in obedience studies (Milgram) and conformity research (Asch). People obey instructions even when the instructions contradict their values or common sense. How It…
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What Is the Gadfly Effect?
Ralph Nader (consumer safety gadfly) highlighted auto safety issues. The auto industry ignored him, so he testified before Congress. His ‘nagging’ eventually led to seatbelts and safety standards. The Original Discovery Named after Socrates, who called himself a gadfly to Athens, stinging the city with questions to challenge complacency. Used by activists, critics, and disruptors…
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What Is Tunnel Vision Effect?
A company obsesses over market share and misses the fact that customer satisfaction is tanking. Revenue grows, but churn accelerates. By the time they notice, customers have already left. The Original Discovery Derived from the literal tunnel vision in visual perception. Daniel Simons and Christopher Chabris demonstrated it famously with the ‘invisible gorilla’ test (1999)—people…
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What Is the Door-in-the-Face Technique?
A charity asks you for $1,000 donation. You refuse. Then they ask for $10. Compared to $1,000, $10 feels reasonable, and you give it. Without the $1,000 anchor, $10 might feel like too much. The Original Discovery Cialdini’s 1975 study. Researchers asked students to chaperone juvenile delinquents for 2 years (outrageous). After refusal, they asked…
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What Is Segal’s Law?
An employee gets feedback from their manager: ‘Great work.’ But a peer says ‘You could improve.’ Now they’re unsure about their actual performance. One opinion was clear; two opinions create doubt. The Original Discovery Attributed to Erich Segal, author of ‘Love Story’ (1970). It illustrates the paradox of conflicting information—having more sources doesn’t increase confidence,…
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What Is Weakest Link?
A website has 99.9% uptime except the database, which fails 1% of the time. The whole system is down 1% of the time, not 0.1%. The weakest link determines system reliability. The Original Discovery Common saying in engineering and systems thinking, but formalized in the 18th century. It appears in various forms: ‘A chain is…
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What Is Authority Bias?
A doctor says a treatment works. You don’t question it. A non-doctor says the same thing with the same evidence, and you’re skeptical. Authority carries weight beyond the evidence. The Original Discovery Demonstrated in famous Milgram experiments (1960s). Subjects administered ‘electric shocks’ to unseen victims because an experimenter in a lab coat told them to.…
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What Is the Anchoring Effect?
A store marks a jacket at $200, then ‘discounts’ it to $120. You feel like you’re saving $80. But if it was always $120, you’d think it’s expensive. The $200 anchor changed your perception. The Original Discovery Tversky and Kahneman’s famous studies in the 1970s. They asked people ‘Is the percentage of African nations in…
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What Is the Kuleshov Effect?
Show a photo of a person with a neutral expression. Show it with sad music — people see sadness. Show the same photo with happy music — people see joy. The image is identical; context changes perception. The Original Discovery Soviet filmmaker Lev Kuleshov conducted experiments in 1922. He showed the same shot of a…
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What Is the Catfish Effect?
Blockbuster Video was complacent, renting VHS tapes and DVDs. When Netflix (the catfish) arrived, Blockbuster should have pivoted. Instead, they dismissed it. By the time they reacted, too late. The Original Discovery Chinese merchants used to transport cod in saltwater with live catfish. The catfish would chase the cod, keeping them active and fresh. Without…
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What Is the Birdcage Effect?
Your parents give you an expensive vase you hate. You can’t throw it out (they’ll be offended), can’t regift it (too distinctive), can’t donate it (feels wrong). So it sits on your shelf for years, taking up space. The Original Discovery Illustrated by Hazel Motes’ story in Flannery O’Connor’s novel. A man is given an…
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What Is Analysis Paralysis?
A customer spends 3 weeks comparing apartment listings, reading reviews, checking neighborhoods. They still can’t decide. They miss all the good apartments while analysis continues. The Original Discovery Not attributed to a single researcher, but widespread in decision theory and economics. Barry Schwartz studied it in his work on choice overload and decision-making paralysis. How…
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What Is the Domino Effect?
2008 financial crisis: subprime mortgage defaults led to bank failures, credit freeze, business bankruptcies, unemployment, and more defaults. Each step mechanically follows from the previous one. The Original Discovery Not attributed to a single source, but popularized in physics and systems thinking. Unlike the Butterfly Effect (unpredictable sensitivity), the Domino Effect is predictable—one domino knocks…
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What Is the Recency Effect?
A movie is 2 hours of mediocrity but ends with an incredible twist. You leave saying ‘great movie.’ You’ve weighted the ending too heavily. The Original Discovery Demonstrated across memory research since the 1950s. In free recall experiments, people remember the last items in a list better than the middle items (primacy is also strong,…
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What Is the Primacy Effect?
Job interview: the first 2 minutes (handshake, first sentence) determines 90% of hiring decisions. Everything else just confirms the initial impression. The Original Discovery Asch and others demonstrated this in 1946. When given a list of traits about a person—’intelligent, industrious, impulsive, critical, stubborn, envious’—people form a positive impression. Reverse the list—same traits, different order—and…
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What Is the Ratchet Effect?
You get a $20K raise. After 3 months, your lifestyle has absorbed it: nicer apartment, better restaurants, fancier car. You feel about as broke as before. The ‘new normal’ has reset upward. The Original Discovery Economist James Duesenberry observed in 1949 that consumption is ‘sticky’—it rises quickly when income rises but doesn’t fall when income…