• Skip to main content
  • Skip to header right navigation
  • Skip to site footer
Farnam Street Logo

Farnam Street

Mastering the best of what other people have already figured out

  • Articles
  • Newsletter
  • Podcast
  • Books
  • Courses
  • Log In
  • Become a Member

Mental Models

The Value of Probabilistic Thinking: Spies, Crime, and Lightning Strikes

Probabilistic thinking is essentially trying to estimate, using some tools of math and logic, the likelihood of any specific outcome coming to pass. It is one of the best tools we have to improve the accuracy of our decisions. In a world …

Read moreThe Value of Probabilistic Thinking: Spies, Crime, and Lightning Strikes

Inertia: The Force That Holds the Universe Together

Inertia is the force that holds the universe together. Literally. Without it, things would fall apart. It’s also what keeps us locked in destructive habits, and resistant to change. * “If it were possible to flick a switch and turn off …

Read moreInertia: The Force That Holds the Universe Together

Reversible and Irreversible Decisions

Making decisions, even in areas you know relatively well, usually involves an element of uncertainty. Sometimes decisions can be made quickly, and uncertainty is acceptable or desirable. Other times, decisions are made slowly and …

Read moreReversible and Irreversible Decisions

First Principles: The Building Blocks of True Knowledge

First-principles thinking is one of the best ways to reverse-engineer complicated problems and unleash creative possibility. Sometimes called “reasoning from first principles,” the idea is to break down complicated problems into basic …

Read moreFirst Principles: The Building Blocks of True Knowledge

Half Life: The Decay of Knowledge and What to Do About It

Understanding the concept of a half-life will change what you read and how you invest your time. It will explain why our careers are increasingly specialized and offer a look into how we can compete more effectively in a very crowded world. …

Read moreHalf Life: The Decay of Knowledge and What to Do About It

The Law of Unintended Consequences: Shakespeare, Cobra Breeding, and a Tower in Pisa

When we try to make a single change within a complex system, we often end up causing unintended consequences. These can be positive or negative. If we don’t anticipate unintended consequences, we can’t expect to achieve our desired …

Read moreThe Law of Unintended Consequences: Shakespeare, Cobra Breeding, and a Tower in Pisa

Pyrrhic Victory: Winning the Battle, Losing the War

The Basics In a classic American folktale, a stubborn railroad worker decides to prove his skill by competing with a drilling machine. John Henry, enraged to hear that machines might take his job, claims that his digging abilities are …

Read morePyrrhic Victory: Winning the Battle, Losing the War

Making the Most of Second Chances

We all get lucky. Once in a while we do something really stupid that could have resulted in death, but didn’t. Just the other day, I saw someone who was texting walk out into oncoming traffic, narrowly avoiding the car whose driver slammed …

Read moreMaking the Most of Second Chances

Bayes and Deadweight: Using Statistics to Eject the Deadweight From Your Life

The quality of your life will, to a large extent, be decided by whom you elect to spend your time with. Supportive, caring, and funny are great attributes in friends and lovers. Unceasingly negative cynics who chip away at your self-esteem? …

Read moreBayes and Deadweight: Using Statistics to Eject the Deadweight From Your Life

OODA LOOP: What You Can Learn from Fighter Pilots About Making Fast and Accurate Decisions

What techniques do people use in the most extreme situations to make decisions? What can we learn from them to help us make more rational and quick decisions? If these techniques work in the most drastic scenarios, they have a good chance …

Read moreOODA LOOP: What You Can Learn from Fighter Pilots About Making Fast and Accurate Decisions

Poker, Speeding Tickets, and Expected Value: Making Decisions in an Uncertain World

You can train your brain to think like CEOs, professional poker players, investors, and others who make tricky decisions in an uncertain world by weighing probabilities. All decisions involve potential tradeoffs and opportunity costs. The …

Read morePoker, Speeding Tickets, and Expected Value: Making Decisions in an Uncertain World

Complexity Bias: Why We Prefer Complicated to Simple

Complexity bias is a logical fallacy that leads us to give undue credence to complex concepts. Faced with two competing hypotheses, we are likely to choose the most complex one. That’s usually the option with the most assumptions and …

Read moreComplexity Bias: Why We Prefer Complicated to Simple

Power Laws: How Nonlinear Relationships Amplify Results

Defining A Power Law Consider a person who begins weightlifting for the first time. During their initial sessions, they can lift only a small amount of weight. But as they invest more time, they find that for each training session, their …

Read morePower Laws: How Nonlinear Relationships Amplify Results

The Fairness Principle: How the Veil of Ignorance Helps Test Fairness

The Basics If you could redesign society from scratch, what would it look like? How would you distribute wealth and power? Would you make everyone equal or not? How would you define fairness and equality? And — here’s the kicker — what if …

Read moreThe Fairness Principle: How the Veil of Ignorance Helps Test Fairness

The Power of Incentives: The Hidden Forces That Shape Behavior

Incentives are what drive human behavior. Understanding incentives is the key to understanding people. Conversely, failing to recognize the importance of incentives often leads us to make major errors. *** According to Charlie Munger, there …

Read moreThe Power of Incentives: The Hidden Forces That Shape Behavior

Complex Adaptive Cities

Complex adaptive systems are hard to understand. Messy and complicated, they cannot be broken down into smaller bits. It would be easier to ignore them, or simply leave them as mysteries. But given that we are living in one such system, it …

Read moreComplex Adaptive Cities

Reciprocation Bias

“There are slavish souls who carry their appreciation for favors done them so far that they strangle themselves with the rope of gratitude.” —Friedrich Nietzsche *** If you are like me, whenever receiving a favor, you too feel an immense …

Read moreReciprocation Bias

The Butterfly Effect: Everything You Need to Know About This Powerful Mental Model

The butterfly effect is an often misunderstood phenomenon wherein a small change in starting conditions can lead to vastly different outcomes. Understanding the butterfly effect can give us a new lens through which to view business, …

Read moreThe Butterfly Effect: Everything You Need to Know About This Powerful Mental Model

How Filter Bubbles Distort Reality: Everything You Need to Know

We find ourselves in a filter bubble any time we’re only surrounded by views and opinions we agree with, while being sheltered from opposing perspectives. Filter bubbles distort our understanding of the world and hamper our ability to make …

Read moreHow Filter Bubbles Distort Reality: Everything You Need to Know

Critical Mass and Tipping Points: How To Identify Inflection Points Before They Happen

Critical mass, which is sometimes referred to as tipping points, is one of the most effective mental models you can use to understand the world. The concept can explain everything from viral cat videos to why changing habits is so hard. …

Read moreCritical Mass and Tipping Points: How To Identify Inflection Points Before They Happen

Attrition Warfare: When Even Winners Lose

When warring opponents use similar approaches and possess similar weapons, trench warfare becomes inevitable. The winning side usually has a slight advantage in production capability or resources. It’s hard to see when you’re in …

Read moreAttrition Warfare: When Even Winners Lose

The Trojan Horse: When True Intents Are Concealed

A Trojan Horse is an innocuous appearing container for hiding something within to get past defenses or some other obstacle. Trojan Horses can be used for both good and evil. Here’s how to recognize and use them. *** The Basics The story of …

Read moreThe Trojan Horse: When True Intents Are Concealed

Human Misjudgment and the American Revolution

We try to look at mental models in history through the lens of people who got it right, but once in a while, it’s beneficial to examine a model through the lens of those who got it wrong. In this case, let’s take a look at the …

Read moreHuman Misjudgment and the American Revolution

Active Listening: The Master Key to Effective Communication

“You cannot truly listen to anyone and do anything else at the same time.” ― M. Scott Peck *** The Basics The sense that we are not being listened to is one of the most frustrating feelings imaginable. Toddlers scream about it, teenagers …

Read moreActive Listening: The Master Key to Effective Communication
← See newer articles
See older articles →

Discover What You’re Missing

Get the weekly email full of actionable ideas and insights you can use at work and home.


As seen on:

Forbes logo
New York Times logo
Wall Street Journal logo
The Economist logo
Financial Times logo
Farnam Street Logo

© 2023 Farnam Street Media Inc. All Rights Reserved.
Proudly powered by WordPress. Hosted by Pressable. See our Privacy Policy.

  • Speaking
  • Sponsorship
  • About
  • Support
  • Education

We’re Syrus Partners.
We buy amazing businesses.


Farnam Street participates in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising commissions by linking to Amazon.