Just-In-Time: The Buffer Was Hiding Something
Cutting inventory frees a lot of cash. The original reason for cutting it was different — stock conceals late suppliers and broken machines, and removing it forces them into view.
Concept
Margin of Safety
Personal Finance: The Boring Part Is the Part That Works
Most attention goes to choosing investments — the part you control least and that matters least. Saving rate, time, and costs decide the outcome, and all three are dull.
Software Engineering: Code Is Read Far More Than It Is Written
Most engineering time goes on code that already exists. Once you accept that, the practices that look like fussiness turn out to be straightforward economics.
Supply Chain and Logistics: The Ocean Is Cheap, the Doorstep Is Not
Crossing an ocean can cost less per item than the final eight kilometres. Once you see logistics as handling events rather than distance covered, most of the field makes sense.
Antifragility: The Things That Get Better When You Drop Them
We label parcels 'fragile' but have no word for the opposite — not strong, which survives shocks unchanged, but something that improves because of them. Your muscles are the everyday example.
Black Swan Events: The Model Was Never the Problem
Every observed swan was white until Australia. No amount of confirming evidence establishes a universal rule — and the most confident moment is often the one just before the record breaks.
Inversion: The Easier List Is the Backwards One
Ask how to be a good manager and you get admirable vagueness. Ask what would make you a terrible one and the answers are specific, short, and something you can act on tomorrow.
Power Laws: When the Average Describes Nobody
The world's tallest person barely moves a room's average height. The world's wealthiest moves it by a factor of millions. Almost all statistical intuition is built for the first case.
Margin of Safety: Building for the Estimate Being Wrong
A bridge expecting ten tonnes is built to hold fifty. The extra capacity will likely never be used — and it is not there for unusual lorries. It is there because the calculations might be wrong.
Venture Capital: The Maths Only Works With Outliers
Most investments return little; one or two return the entire fund. Every practice in the industry that looks strange from outside is a rational response to that distribution.
Markets: A Price Is a Bet, Not a Measurement
A company posts record profits and the share price falls. That stops looking irrational once you see that a price already contains what everyone expected — and moves only on the difference.