Latest posts
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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…
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What Is the Matthew Effect?
Two papers on identical findings are published. One by a Nobel laureate, one by an unknown researcher. The Nobel laureate’s paper gets cited 100x more often—not because it’s better written, but because Nobel laureates’ names attract attention. The Original Discovery Named after Matthew 25:29 in the Bible: ‘For unto every one that hath shall be…
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What Is the Butterfly Effect?
In 1989, a Libyan passport officer decided to stamp one more visa without proper paperwork. This led to the bombing of Pan Am Flight 103, which killed 270 people and changed aviation security forever. The Original Discovery Edward Lorenz, a meteorologist, discovered this principle in 1960 while running weather simulations on an early computer. He…
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What Is Goodhart’s Law? When Metrics Stop Working
Goodhart’s Law: when a measure becomes a target, it ceases to be a good measure. Here’s why metrics get gamed, real examples, and what to do instead.
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What Is the Pareto Principle (80/20 Rule)? How to Find the Vital Few
The Pareto Principle (80/20 Rule) says 80% of results come from 20% of causes. Here’s the origin, real examples, and how to use it to work smarter.
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What Is the Streisand Effect? Why Trying to Hide Something Makes It Viral
The Streisand Effect: attempts to suppress information online make it spread faster. Named after a 2003 lawsuit that turned a private photo into global news.
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What Is the Halo Effect? How One Trait Colors Everything
The Halo Effect means a positive impression in one area shapes how we judge everything else. Here’s the science, examples, and why it’s so hard to avoid.