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First-principles thinking means breaking a problem down to what you know is true and reasoning up from there — instead of copying what everyone already does. Examples:
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5 examples of first-principles thinking
Rocket costs from scratch Instead of accepting the going price, ask what a rocket is actually made of (metal, fuel) and rebuild the cost from there.
Cooking without a recipe Understanding why each step works lets you adapt freely, instead of blindly following instructions.
Questioning 'best practice' Asking 'why do we do it this way?' often reveals the original reason vanished years ago.
Pricing a product Build the price up from real costs and value delivered, not from 'what competitors charge.'
Learning a field fast Master the handful of core principles and you can derive the rest — instead of memorising a thousand surface facts.
How to spot it in yourself
Take a 'that's just how it's done' rule in your work and ask what the actual reason is — often the reason expired years ago.
When a cost or constraint feels fixed, break it into parts and price each one from scratch; fixed things often aren't.
Before copying a competitor, write down the raw goal and design from that, not from their version of it.
Go deeper — get the full book
Loved these examples? Listen to The Great Mental Models by Shane Parrish free with an Audible trial — or read it in full.
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