Your brain is lying to you. 100 times a day.
100 cognitive biases decoded — understand why you make the decisions you do.
You think you are rational.
You are not.
Every day your brain takes shortcuts that cost you money, relationships, and opportunities — and you will never catch them unless you know what to look for. Neither is anyone else.
Psychologists have catalogued over 100 of these shortcuts. BiasBreakdown explains every single one in plain language, with real-world examples from your own life.
What Is Inside
6 of the 100 biases — a preview of what awaits.
Confirmation Bias
Why you only see evidence that agrees with you and filter out everything else.
Sunk Cost Fallacy
Why you keep throwing good money, time, and energy after bad.
Loss Aversion
Why losing $100 hurts twice as much as gaining $100 feels good.
Planning Fallacy
Why every project takes twice as long as you think — every time.
Dunning-Kruger Effect
Why the least skilled people are often the most confident.
Anchoring
Why the first number you see shapes every decision that follows.
+ 94 more biases covering money, memory, relationships, politics, and more.
Each chapter is short, clear, and immediately useful
No academic language. No filler. Just the bias, why it happens, and what to do about it.
What Readers Are Saying
Real readers. Real results.
“I thought I was making rational decisions. This book showed me I hadn't made a single one in years.”
Sarah M.
Marketing Director
“Finally understood why I kept picking the wrong investments. Terrifying and liberating in equal measure.”
James K.
Software Engineer
“Read the chapter on sunk cost fallacy on a Tuesday. Quit a job I'd been miserable at for three years by Friday.”
Priya L.
Freelance Designer
Bias Packs — $0.99 Each
Ten focused packs, each covering one specific blind spot. All 10 available now — or subscribe monthly to get new packs as they drop.
Influence & Authority Pack
Authority bias, halo effect, and the curse of knowledge — decoded.
Decision Traps Pack
Anchoring, gambler's fallacy, and status quo bias — why your choices aren't yours.
Attribution & Projection Pack
Attribution error, projection bias, and rosy retrospection — decoded.
Identity & Ego Pack
Spotlight effect, impostor syndrome bias, and self-serving bias — decoded.
Fixed Thinking Pack
Functional fixedness, Einstellung effect, and belief perseverance — decoded.
Negotiation Traps Pack
BATNA blindness, reactive devaluation, and zero-sum bias — decoded.
Can't pick just one? The full book has all of them.
Get all 100 biases — $9.99Get the Book
One-time purchase or monthly access. No hidden fees.
Read the chapter on sunk cost fallacy on a Tuesday. Quit a job I'd been miserable at for three years by Friday.
Priya L. · Freelance Designer
The Book
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- 100 cognitive biases decoded
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Full Library — All 3 Brands
BiasBreakdown + DecodedWisdom + ModernDysfunction.
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Common Questions
A 100-chapter book that explains the cognitive biases — the mental shortcuts — that quietly shape every decision you make. Each chapter is short, practical, and written to make you go 'oh, that is me'.
PDF. Works on desktop, phone, tablet, or print it out. Download link arrives instantly.
Instantly. You receive a download link by email the moment you pay. No waiting. Click and read.
Yes. If you are not satisfied within 30 days, email us and we will refund you in full. No questions asked.
Yes. If we revise or expand the book, you get the new version at no extra cost.
It is not a textbook. Each bias is explained in plain language with a specific, real-world scenario — the kind you will immediately recognise from your own life.
Help unlock BiasBreakdown Book 2
BiasBreakdown Book 2 publishes when we reach 200 readers. Every purchase counts toward the goal.
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BiasBreakdown — 100 Cognitive Biases Decoded