Behavioural Biases
Your biases are running. The question is whether you're aware of them. Knowing your biases is self-mastery — the foundation of agency. Using them is persuasion. Both directions start here.
Two systems. One fast, one slow. System 1 is intuitive, emotional, effortless. System 2 is deliberate, analytical, costly. Under pressure, System 1 wins — and biases ride in with it.
These are not bugs to fix. They are features of human nature — patterns that held across all cultures and all time. Understanding them lets you work with human nature instead of against it.
Three defences:
- Mantras — short phrases that reset orientation when System 2 is offline
- Systems — engineering that makes the right path the easy path
- Prompts — open-loop questions that force System 2 back online
Human Nature
The universal patterns. These run deeper than individual biases — they are the operating system.
| Pattern | Mechanism | The Question |
|---|---|---|
| Reciprocity | Humans feel obligated to return what they receive | What are you giving? What are you owed? |
| Status | Every group develops rank. Dominance (power) or prestige (skill) | What status game are you playing? |
| In-Group | We naturally favour "us" over "them" | Who's in your tribe? Who's excluded? |
| Loss Aversion | Losses hurt ~2x more than equivalent gains feel good | What loss are they afraid of? |
| Narrative | Humans understand through stories, not data | What story are they telling themselves? |
| Habit | Cue → Routine → Reward. We are what we repeatedly do | What cues trigger what routines? |
| Social Proof | When uncertain, people look to others for guidance | Who are they looking to? |
| Consistency | People act consistently with prior commitments | What have they already committed to? |
Biases as Tools
Biases are not just traps. They are levers. In a pitch, each slide loads specific biases to create movement:
| Layer | Biases loaded | What it does |
|---|---|---|
| Pitch (bullets) | Confirmation, Loss aversion, Fear | Confirms what they already feel — builds tension |
| Prompt (question) | Zeigarnik, Hyperbolic discounting | Opens a loop they can't close — creates pull |
| Depth (link) | IKEA effect, Reciprocity | Co-creates value — builds ownership and obligation |
The same biases that trap you in lazy thinking can move others toward better decisions — if you use them honestly.
Dig Deeper
- Zeigarnik Effect — Why open questions create forward motion (the engine behind prompts)
- Loss Aversion — Why the pain of losing outweighs the pleasure of gaining
- Confirmation Bias — Why we favour existing beliefs
- IKEA Effect — Why we overvalue what we co-create
- Reciprocity — Why giving first creates obligation
- Decision Fatigue — Why fewer options convert better
- Hyperbolic Discounting — Why near-term rewards outweigh distant ones
- Fear Sells — Why fear creates urgency and dreams create direction
Matrix
| Bias | Question | Mantra |
|---|---|---|
| Action Bias | Why do we prefer doing something to doing nothing? | Measure before you move |
| Affect Heuristic | Why do we rely on our current emotions when making quick decisions? | Principles, not emotions |
| Ambiguity Effect | Why do we prefer options that are known to us? | |
| Anchoring Bias | Why we tend to rely heavily upon the first piece of information we receive? | What's the base rate? |
| Attentional Bias | Why do we focus more on some things than others? | |
| Availability Heuristic | Why do we tend to think that things that happened recently are more likely to happen again? | |
| Bandwagon Effect | Why do we support opinions as they become more popular? | |
| Barnum Effect | Why do we believe our horoscopes? | |
| Base Rate Fallacy | Why do we rely on specific information over statistics? | |
| Bikeshedding | Why do we focus on trivial things? | |
| Bottom-Dollar Effect | Why do we transfer negative emotions about being broke on items that we purchase? | |
| Bounded Rationality | Why are we satisfied by "good enough"? | |
| Bundling Bias | Why do we value items purchased in a bundle less than those purchased individually? | |
| Bye-Now Effect | Why are we likely to spend more after reading the word “bye”? | |
| Cashless Effect | Why does paying without physical cash increase the likelihood that we purchase something? | |
| Category Size Bias | Why do we think we're more likely to win at the big casino versus the small one? | |
| Choice Overload | Why do we have a harder time choosing when we have more options? | |
| Cognitive Dissonance | Why is it so hard to change someone's beliefs? | |
| Commitment Bias | Why do people support their past ideas, even when presented with evidence that they're wrong? | |
| Confirmation Bias | Why do we favour our existing beliefs? | What would prove me wrong? |
| Decision Fatigue | Why do we make worse decisions at the end of the day? | Decide in the morning |
| Declinism | Why we feel the past is better compared to what the future holds? | |
| Decoy Effect | Why do we feel more strongly about one option after a third one is added? | |
| Disposition Effect | Why do we tend to hold on to losing investments? | |
| Distinction Bias | Why we tend to view two options as more distinctive when evaluating them simultaneously then separately. | |
| Dunning-Kruger Effect | Why can we not perceive our own abilities? | What don't I know I don't know? |
| Empathy Gap | Why do we misinterpret how much our emotions influence our behavior? | |
| Endowment Effect | Why do we value items more if they belong to us? | |
| Extrinsic Incentive Bias | Why do we think others are in it for the money, but we're in it for the experience? | |
| Framing Effect | Why do our decisions depend on how options are presented to us? | |
| Functional Fixedness | Why do we have trouble thinking outside the box? | |
| Fundamental Attribution Error | Why do we underestimate the influence of the situation on people's behavior? | |
| Gambler's Fallacy | Why do we think a random event is more or less likely to occur if it happened several times in the past? | |
| Google Effect | Why do we forget information that we just looked up? | |
| Halo Effect | Why do positive impressions produced in one area positively influence our opinions in another area? | |
| Hard-easy Effect | Why is our confidence disproportionate to the difficulty of a task? | |
| Hindsight Bias | Why do we see unpredictable events as predictable after they occur? | What did I predict before? |
| Hot-hand Fallacy | Why do we expect previous successful performance to lead to future successful performance? | |
| Hyperbolic Discounting | Why do we value immediate rewards more than long-term rewards? | What compounds? |
| Identifiable Victim Effect | Why are we more likely to offer help to a specific individual than a vague group? | |
| IKEA effect | Why do we place disproportionately high value on things we helped to create? | Build it with them |
| Illusion of Control | Why we believe we have more control over the world than we actually do? | |
| Illusion of Validity | Why are we overconfident in our predictions? | |
| Illusory Correlation | Why do we think some things are related when they aren't? | |
| Illusory Truth Effect | Why do we believe misinformation more easily when it's repeated many times? | |
| In-group Bias | Why do we treat our in-group better than we do our out-group? | |
| Incentivization | Why do we work harder when we are promised a reward? | |
| Just-world Hypothesis | Why do we believe that we get what we deserve? | |
| Lag Effect | Why does spacing out the repetition of information make one more likely to remember it? | |
| Law of the Instrument | Why do we use the same skills everywhere? | |
| Less-is-better Effect | Why do our preferences change depending on whether we judge our options together or separately? | |
| Levelling and Sharpening | Why do we exaggerate some details of a story, but minimize others? | |
| Levels of Processing | Why do we remember information that we attach significance to better than information we repeat? | |
| Levels-of-processing Effect | Why repetition improve memory retention | |
| Look-elsewhere Effect | Why do scientists keep looking for a statistically significant result after failing to find one initially? | |
| Loss Aversion | Why do we buy insurance? | What am I losing right now? |
| Mental Accounting | Why do we think less about some purchases than others? | |
| Mere Exposure Effect | Why do we prefer things that we are familiar with? | |
| Motivating Uncertainty Effect | Why rewards of unknown sizes tend to motivate us more than known rewards | |
| Naive Allocation | Why we tend to prefer spreading limited resources evenly across options | |
| Negativity Bias | Why is the news always so depressing? | |
| Noble Edge Effect | Why do we tend to favour brands that show care for societal issues? | |
| Nostalgia Effect | How do our sentimental feelings for the past influence our actions in the present? | |
| Observer Expectancy Effect | Why do we change our behavior when we're being watched? | |
| Omission Bias | Why don't we pull the trolley lever? | |
| Optimism Bias | Why do we overestimate the probability of success? | What would kill this? |
| Ostrich Effect | Why do we prefer to ignore negative information? | |
| Overjustification Effect | Why do we lose interest in an activity after we are rewarded for it? | |
| Peak-end Rule | How do our memories differ from our experiences? | |
| Pessimism bias | Why do we think we're destined to fail? | |
| Planning Fallacy | Why do we underestimate how long it will take to complete a task? | Multiply by two |
| Primacy Effect | Why do we only remember the first things on our grocery list? | |
| Priming | Why do some ideas prompt other ideas later on without our conscious awareness? | |
| Projection Bias | Why do we think our current preferences will remain the same in the future? | |
| Reactive devaluation | Why is negotiation so difficult? | |
| Regret Aversion | Why do we anticipate regret before we make a decision? | |
| Representativeness Heuristic | Why do we use similarity to gauge statistical probability? | |
| Response Bias | Why responses to a survey or experiment can be inaccurate due to the nature of the survey or experiment | |
| Restraint Bias | Why do we overestimate our self-control? | |
| Rosy Retrospection | Why do we think the good old days were so good? | |
| Salience Bias | Why do we focus on items or information that are more prominent and ignore those that are not? | |
| Self-serving Bias | Why do we blame external factors for our own mistakes? | |
| Serial Position Effect | Why do we better remember items at the beginning or end of a list? | |
| Sexual Overperception Bias | Why do men think that women are always flirting with them? | |
| Social Norms | Why do we follow the behavior of others? | |
| Source Confusion | Why we forget where our memories come from, and thereby lose our ability to distinguish the reality or likelihood of each memory | |
| Spacing Effect | Why do we retain information better when we learn it over a long time period? | |
| Spotlight Effect | Why do we feel like we stand out more than we really do? | |
| Status Quo Bias | Why do we tend to leave things as they are? | What's the cost of staying? |
| Suggestibility | Why is yawning contagious? | |
| Survivorship Bias | Why do we misjudge groups by only looking at specific group members? | Where are the dead? |
| Take-the-best Heuristic | Why do we focus on one characteristic to compare when choosing between alternatives? | |
| Telescoping Effect | Why do some things "seem like they just happened yesterday?" | |
| The Illusion of Explanatory Depth | Why do we think we understand the world more than we actually do? | |
| The Pygmalion effect | Why do we perform better when someone has high expectations of us? | |
| The Sunk Cost Fallacy | Why are we likely to continue with an investment even if it would be rational to give it up? | Would I start this today? |
| Zero Risk Bias | Why do we seek certainty in risky situations |
Context
- Agency — Self-mastery of biases is the foundation of agency
- Credibility — Your prediction track record, distorted by biases you don't see
- Forecasting — Overconfidence, confirmation, and anchoring are the three that damage accuracy most
- Mantra — Short phrases that counter biases under pressure
- Tight Five — Five prompts that use Zeigarnik to create forward motion
- Prompt Deck — The instrument that renders bias-loaded slides
- Persuasion — The rhetoric framework biases serve
- Decision Making — Systems that prevent bias traps
Links
Questions
If biases are both traps and levers, how do you know when you're using one ethically versus exploiting it?
- Which mantra in the matrix above would have saved you from the worst decision you made this year?
- If System 1 always wins under pressure, is the real skill designing environments where System 1 makes good choices?
- When you stack three biases in a pitch, at what point does persuasion become manipulation?