Latest posts
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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…
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What Is Herd Mentality?
Cryptocurrencies double in a week. No change to the technology, no new utility. But everyone is talking about it, so people buy in. ‘If everyone else is doing it, it must be smart.’ The Original Discovery Observed across human societies since antiquity. Formally studied by Solomon Asch in the 1950s: he showed that even when…
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What Is the 10,000-Hour Rule?
The Beatles played ~1,200 live shows between 1960-1964, accumulating ~10,000 hours on stage before Beatlemania. They were good earlier, but not great. After 10K hours, they were unstoppable. The Original Discovery Malcolm Gladwell popularized this in ‘Outliers’ (2008), citing research by Anders Ericsson. But the idea predates Gladwell: sports coaches have long known that 10,000…
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What Is Parkinson’s Law?
You’re given a week to finish a report. You spend 3 days planning, 2 days writing, 1 day editing, 1 day formatting. If the deadline was tomorrow, you’d finish today—same quality report. The Original Discovery Cyril Northcote Parkinson observed this in British government in 1955. A bureaucrat took the same time to draft a memo—whether…
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What Is the Hawthorne Effect?
Employees are 20% more productive on the day their manager sits in their area. The next day, the manager leaves and productivity drops. Nothing changed except the presence of observation. The Original Discovery Researchers at the Hawthorne Works factory (1924) wanted to understand how lighting affects productivity. They dimmed the lights—productivity went up. They brightened…
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What Is the Barnum Effect?
A horoscope says ‘You are sensitive to the feelings of others, but sometimes hide your true feelings.’ 80% of people reading this think it’s specifically about them. It describes nearly everyone. The Original Discovery Named after P.T. Barnum’s famous (misquoted) line: ‘There’s a sucker born every minute.’ Psychologist Bertram Forer demonstrated it in 1949. He…
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What Is the Pygmalion Effect?
A coach tells a young swimmer ‘You have a gift for this.’ The swimmer trains harder, gets better coaching opportunities, and eventually makes the Olympics. Another equally talented kid is told ‘You’re okay, but not special.’ They quit at age 14. The Original Discovery Rosenthal and Jacobson conducted a famous 1968 study. They told teachers…