One Model at A Time

In March 2021, the Ever Given wedged sideways in the Suez Canal, and for six days a huge share of world trade simply stopped. Today's mental model is bottlenecks: in any chain, one narrow point sets the pace for everything. Find the bottleneck and you find the leverage. Plus the bottleneck behind the artificial intelligence boom — and why owning a bottleneck can be the best business there is.

One Model at a Time is a Thousand Bagger show. New episodes daily.

You tidy your desk on Monday; by Friday it's buried again, and you never set out to make a mess. Disorder grows on its own — that's entropy, and fighting it takes constant energy. Today's mental model explains why maintenance is forever, in houses, companies, and code. Plus how an airline ended up cancelling more than 16,000 flights over the Christmas holidays.

One Model at a Time is a Thousand Bagger show. New episodes daily.

A microphone gets too close to a speaker and the screech climbs higher and higher. Sound feeds back into itself, amplifying each round. Today's mental model is feedback loops: outputs that become new inputs, for better or worse. They explain bank runs, viral hits, and market bubbles. Plus why most of what people watch on YouTube isn't something they searched for.

One Model at a Time is a Thousand Bagger show. New episodes daily.

Yank a tablecloth away fast enough and the dishes stay exactly where they were. Objects resist changes to their motion — that's inertia, and it applies to far more than physics. Today's mental model is inertia and momentum: habits, companies, and industries all keep moving in the direction they're already going. Plus the company that invented the digital camera, then went bankrupt because of it.

One Model at a Time is a Thousand Bagger show. New episodes daily.

You buy a 500,000-dollar home with 25,000 dollars down. Prices fall five percent — and every dollar of your own money is gone. Today's mental model is leverage: borrowing multiplies your gains, and your losses, by the same factor. Plus the 158-year-old bank that borrowed around 30 dollars for every dollar of its own, and what leverage means for investors who think they're being careful.

One Model at a Time is a Thousand Bagger show. New episodes daily.

In a busy supermarket, the checkout lines are usually about the same length. Nobody planned it — shoppers just keep switching to the shorter line until they're even. Today's mental model is equilibrium: systems settle where the pressures balance. Plus why Bitcoin once cost far more in South Korea than almost anywhere else, and what happens when something stops an equilibrium from forming.

One Model at a Time is a Thousand Bagger show. New episodes daily.

Google+ had billions of users, enormous resources, and some of the best engineers in the world. It still died. Today's mental model is critical mass: a network is worthless until enough people are on it — and getting those first users is the hardest part of all. That's why Facebook launched at just one college at a time, and why most social apps never make it past the empty room.

One Model at a Time is a Thousand Bagger show. New episodes daily.

Water at 99 degrees Celsius and water at 100 look almost identical — but one is hot water and the other is steam, and steam can power a locomotive. Today's mental model is breakpoints and tipping points: most change is gradual, until it isn't. Small pushes near a threshold produce enormous results. Plus the country where electric cars went from almost nothing to nearly nine in ten new cars sold.

One Model at a Time is a Thousand Bagger show. New episodes daily.

A modern passenger jet can fly safely on one engine — so why build it with two? Because the one time the first engine fails, the second is the difference between a story and a tragedy. Today's mental model is redundancy and backup systems: cheap insurance against rare catastrophe. Plus how one software update grounded thousands of flights, and where redundancy is worth the cost in your own life.

One Model at a Time is a Thousand Bagger show. New episodes daily.

Warren Buffett once explained investing with a bridge: build it to carry 30,000 pounds, then only drive 10,000-pound trucks across it. Today's mental model is margin of safety — the gap between what something can handle and what you ask of it. It's the difference between surviving a mistake and being destroyed by one. Plus a hundred-year-old company that went bankrupt about two months after the world stopped.

One Model at a Time is a Thousand Bagger show. New episodes daily.