·3 min read
Probability vs Plausibility: How a Good Story Tricks Your Brain
Bayesian thinking shows why a vivid story beats a base rate, and why your conjunction fallacy keeps choosing the wrong answer about a stranger named Karen.
Framework
First Principles Thinking
First principles thinking removes inherited explanations, convenient labels, and stale assumptions. It asks what is actually true, then rebuilds the decision from those truths instead of from social defaults.
From Aristotle
When this helps
- The usual answer feels copied from the market, culture, family, or your past self.
- A decision is tangled in assumptions that nobody has recently checked.
- You need to simplify a complex problem without pretending it is easy.
How to use it
Step 1
List the assumptions
Write the beliefs, constraints, and inherited rules that seem to define the decision.
Step 2
Keep only what is true
Test each assumption against evidence, direct observation, and constraints that cannot be wished away.
Step 3
Rebuild from the facts
Use the remaining truths to generate options that may not appear under the old framing.
Watch for
- Calling an opinion a first principle because it feels obvious.
- Stripping away context that is genuinely relevant to the decision.
- Using analysis as a way to avoid choosing after the assumptions are clear.
Related thinking traps
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·2 min read
The Narrative Fallacy: When Good Stories Make Bad Decisions
The narrative fallacy is the cognitive bias that lets a good story stand in for actual evidence. Here is how it shapes our decisions, and our marketing.
Try it now
What am I treating as true only because I have heard it repeated?
Open ClearMind