Isabelle Yu

I take businesses apart to find the decision they turned on. Most of the ones I cannot stop thinking about sell clothes, bags or lipstick.

I am a high-school student, and I host a podcast called The Strat. One company an episode, told for the strategy underneath the story: what it decided, when it could have decided otherwise, and what that decision was worth. The show started with the founding stories of twenty-four giants and has kept going, into the mall, into the hype cycle, and into the beauty counter.

What I am actually interested in is how a company becomes worth what it is worth. I find that question sharpest in fashion and beauty, because those are the industries where the product itself explains almost none of the price. A Birkin is leather and thread. A foundation is pigment in a base. Everything above the cost of the object is a decision somebody made, and I want to know which one.

This site is where I write the decisions down. Every episode gets its notes; the companies I know best get a full teardown, with the numbers; and the forks the founders faced get posed to you before the answer is given, because reading about a call is easy and making it is not.

Listen to The Strat Every episode, with notes

§01 — What I keep coming back to

Strategy, taken apart

Not the legend, the decision. Every company here had a moment where a reasonable person could have gone the other way, and that moment is what I want to find.

Fashion houses

Chanel, Hermès, Prada, Miu Miu, and the groups behind them. Luxury is the industry where the object costs the least and the meaning costs the most, which makes it the purest strategy problem there is.

Beauty

A lipstick is chemically almost identical from one counter to the next, so everything that makes one worth more is strategy: the founder, the shade range, the retailer that agreed to carry it. Glossier to Fenty to Charlotte Tilbury.

The mall, and what replaced it

Aritzia, Abercrombie, Brandy Melville. Who owns my generation's wardrobe, how they took it, and what the sizing chart is really saying.

Crazes

Stanley cups, Labubu, Jellycat. How an ordinary object becomes something people queue for, and whether the company learned to make waves or only rode one.

The numbers

Margins, cash, what the market is paying. The story is the reason to look; the statements are how you find out whether it was true.

The show's 4 runs follow the same interests, in roughly that order.

§02 — Why this exists

I kept finding the interesting part buried three hundred pages in.

I read business biographies for fun, which is a strange sentence to write, and I kept running into the same problem: the decision that actually mattered gets one paragraph, somewhere in the middle, and the rest is the legend.

So I started the podcast to pull that paragraph out and say it in twelve minutes. Then I ran into the second problem — twelve minutes is not enough to show whether the company is actually any good. A story about how Hermès built a waiting list is interesting. A forty-percent operating margin is the proof.

This site is where I show the work. The companies I know best become full teardowns: how the company makes money, why the profits last, what the statements say, what the market is paying, and whether I would own it. Every episode, from the founding stories to the beauty counter, gets the strategy named in one line and notes on what to listen for. Then I put the decision back in your hands.

All of it is free and public. The strategy that builds great companies sits behind expensive books and business schools, and there is no reason a sixteen-year-old should have to wait ten years and pay a tuition bill to see it.

§03 — How a case is made

01 Read
The biography, the founder interviews, and the filings. Where a company is private or sits inside a conglomerate, I read the parent's segment reporting and accept that some figures will only ever be estimates.
02 Find the fork
Every company has a moment where a reasonable person could have gone the other way. That moment becomes the episode and the decision tutorial.
03 Run the frameworks
The same eight, in the same order, whether the company is a couture house or a games console. Applying them to a company I love is the part that takes discipline.
04 Write the verdict
Own it, watch it, or pass — plus the specific thing that would change my mind. Writing that condition down in advance is what stops the analysis from being a fan letter.
05 Tag and publish
The case is tagged with the mechanisms it demonstrates, which is what lets the pattern engine read across the whole library rather than one case at a time.

§04 — On the numbers

Where they come from. Public filings wherever one exists — 10-Ks, annual reports, segment disclosures. Each figure carries the period it refers to, because a margin without a date is not a fact.

When they are estimates. Most of the luxury and beauty houses here do not report separately. Chanel discloses annually; Dior sits inside an LVMH division; NARS and M.A.C. do not break out at all. Where a number is an estimate or a division-level allocation, the case says so in plain language rather than borrowing the authority of a precise figure it has not earned.

When I do not know. I write that I do not know. A vaguer statement that is true is worth more than a precise one that is invented, and this is the rule I care most about keeping.

What this is not. It is not investment advice, and the verdicts are opinions written by a high school student who is still learning. Argue with them. That is the useful way to read them.

§05 — The library, counted

Company teardowns: 46
Podcast episodes: 51
Founder profiles: 56
Decision tutorials: 30

Start with the library Listen to The Strat