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Charlie Munger borrowed heavily from physics when he insisted on thinking in 'inversions' — instead of asking how to succeed, ask what would guarantee failure, then avoid it. Applied to product decisions: don't ask what features users want. Ask what would make them definitely stop using your product, then make sure none of those are true. Most strategic errors aren't failures of vision; they're failures to clearly see the obvious ways you're losing.
What would make your best customers quietly stop using your product or working with you — and are any of those things quietly happening right now?
Decision Theory — Charlie Munger
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Inversion — Charlie Munger's favorite mental model — transforms how you build product roadmaps. Instead of asking 'what should we build next?', ask 'what would guarantee this product fails?' The features you'd never ship become guard rails. The assumptions you'd never test become your biggest risks. The best PMs don't just prioritize what to do — they systematically eliminate what not to do.
What's one assumption in your current roadmap that you've never tried to disprove?
Decision Theory × Product Strategy
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From the archive
Real nudges, for people who take their thinking seriously
Trusted by founders, operators, and thinkers who've outgrown generic content.
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Drawing from traditions across the world
“The unexamined life is not worth living.”
— Socrates
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