L3VLUP Atlas

Discover ideas. Connect knowledge. Put it to work.

The best ideas in business, investing and technology are scattered across books, films, lectures, letters and research. Atlas gathers them as ideas rather than titles: what the idea is, why it matters, where it came from and how to use it, with the original one click away.

Search for an idea 116 ideas · 112 sources · 12+ people

Frameworks worth knowing

Mental models that organise a problem before you start on it.

All frameworks →

FrameworkBankingFilm
A bank run is a maturity mismatch, not a solvency problem
A bank fails when its liabilities come due faster than its assets, which can happen to a solvent bank.
From It's a Wonderful Life · 1946
FrameworkCrises and market historyBook
A bubble needs marketability, money and credit, and speculation together
Check all three legs, marketability, cheap money and a population buying for resale, before calling something a bubble.
From Boom and Bust · William Quinn and John D. Turner
Case studyCreditBook
A capital structure is a set of rights people will litigate over
In distress, a claim is worth what its documents let it argue for, not where it sits on the slide.
From The Caesars Palace Coup · Max Frumes and Sujeet Indap
TechniqueValuationVideo located
A capital-structure-neutral cash flow needs a capital-structure-neutral discount rate
Match the discount rate to the cash flow: a flow to all capital providers is discounted at the blended cost of all of them.
From WACC Explained · The Finance Storyteller
FrameworkInvestingFilm
A cheap measurable signal beats an expensive intuitive one at scale
The market misprices what is hard to measure, so a consistent cheap signal can beat an expensive expert.
From Moneyball · 2011
FrameworkCapital allocationBook
A chief executive is a capital allocator first and an operator second
Judge a chief executive by what they do with the cash, not by how well they run what produces it.
From The Outsiders · William N. Thorndike

Contrarian thinking

Arguments that disagree with the received view, and the strongest case against each.

All arguments →

ArgumentGrowth and business modelsBook
Competition and profit rarely occupy the same market
Ask how a business escapes competition before asking how large its market is.
From Zero to One · Peter Thiel and Blake Masters
FrameworkSoftware engineeringBook
Complexity is what you must hold in your head to make a safe change
Judge a design by how much a reader must understand to change it safely, and prefer deep modules behind small interfaces.
From A Philosophy of Software Design · John Ousterhout
Post-mortemCapital allocationDocumentary
Financial discipline applied without limit eventually eats the engineering
Cost discipline has a limit, and the cost of crossing it arrives years after the reward for approaching it.
From Downfall: The Case Against Boeing · 2022
Decision principleInvestingBook
One person's record is a story about survivorship until proven otherwise
Ask how many people ran the same method and are not in the sample before treating a record as evidence of skill.
From How I Made $2,000,000 in the Stock Market · Nicolas Darvas
FrameworkRiskLetter located
Risk is the probability of losing purchasing power, not the volatility of the price
Measure risk as the chance of ending the holding period with less buying power, which makes volatile productive assets safer than stable unproductive ones.
From Berkshire Hathaway's 2011 letter to shareholders · Warren Buffett
ArgumentArtificial intelligenceBook
A model trained on a biased outcome will reproduce it at scale
A model predicts the past decisions in its training data; if those were biased, the model is a bias machine with a straight face.
From Weapons of Math Destruction · Cathy O’Neil

Mistakes and post-mortems

What went wrong, said precisely, by the people who were there.

All post-mortems →

Post-mortemFounders and companiesDocumentary
A board that accepts a narrative has stopped doing diligence
A compelling story is a claim to test, and the test for a technology is watching it work.
From The Inventor: Out for Blood in Silicon Valley · 2019
Post-mortemInvestingLetter located
A bad year separated into its causes: which mistakes were mine and which were the market
Separate a bad year into your errors and the market's mood, name the errors specifically, and say whether the method changes.
From Giverny Capital's 2025 annual letter, on a year of underperformance · François Rochon
LessonRiskLetter located
Beware of geeks bearing formulas: a model built on calm history cannot see the storm
Ask what period a model was fitted to, and whether that period contained the event you are worried about.
From Berkshire Hathaway's 2008 letter to shareholders · Warren Buffett
Post-mortemCapital allocationDocumentary
Financial discipline applied without limit eventually eats the engineering
Cost discipline has a limit, and the cost of crossing it arrives years after the reward for approaching it.
From Downfall: The Case Against Boeing · 2022
ArgumentCrises and market historyDocumentary
The incentives ran through the ratings agencies and the academy, not only the banks
Follow the incentives through every institution in the chain, including the ones that were supposed to be the check.
From Inside Job · 2010
Post-mortemRiskFilm
One person holding both the trade and its settlement is the whole failure
Whoever can take a position must not be the person who confirms it. Separate the hands, and the rest of the controls become possible.
From Rogue Trader · 1999

Learnings from books

One idea per book, from the Library shelves.

All sources →

FrameworkCrises and market historyBook
A bubble needs marketability, money and credit, and speculation together
Check all three legs, marketability, cheap money and a population buying for resale, before calling something a bubble.
From Boom and Bust · William Quinn and John D. Turner
Case studyCreditBook
A capital structure is a set of rights people will litigate over
In distress, a claim is worth what its documents let it argue for, not where it sits on the slide.
From The Caesars Palace Coup · Max Frumes and Sujeet Indap
FrameworkCapital allocationBook
A chief executive is a capital allocator first and an operator second
Judge a chief executive by what they do with the cash, not by how well they run what produces it.
From The Outsiders · William N. Thorndike
TechniqueMarketsBook
A commodity index does not return what the spot price did
Returns on a rolled futures position include the roll, so the shape of the curve matters as much as where spot goes.
From The Little Book of Commodity Investing · John Stephenson
Decision principleDecision-makingBook
A good decision and a good outcome are separate things
Judge a decision by what was knowable when it was made, and keep the outcome in a separate column.
From Thinking in Bets · Annie Duke
FrameworkInvestingBook
A handful of outcomes carries a portfolio, and a career
Results come from a few outcomes, so the job is to survive long enough to be there when they arrive.
From The Psychology of Money · Morgan Housel

Lessons from films and documentaries

What a scene gets right, and the mechanism underneath it.

All sources →

FrameworkBankingFilm
A bank run is a maturity mismatch, not a solvency problem
A bank fails when its liabilities come due faster than its assets, which can happen to a solvent bank.
From It's a Wonderful Life · 1946
Post-mortemFounders and companiesDocumentary
A board that accepts a narrative has stopped doing diligence
A compelling story is a claim to test, and the test for a technology is watching it work.
From The Inventor: Out for Blood in Silicon Valley · 2019
FrameworkInvestingFilm
A cheap measurable signal beats an expensive intuitive one at scale
The market misprices what is hard to measure, so a consistent cheap signal can beat an expensive expert.
From Moneyball · 2011
TechniqueMarketsFilm
A corner works because someone must deliver what they have sold
A short position is a promise to deliver; whoever controls what must be delivered controls the price.
From Trading Places · 1983
Case studyDeals and M&AFilm
A management buyout puts the seller on both sides of the table
In a management buyout the insider is the buyer, so the board's job is to make the market, not take the offer.
From Barbarians at the Gate · 1993
FrameworkCrises and market historyFilm
A rating is a model output, and the model rests on a correlation assumption
Ask what a rating assumes about defaults happening together before trusting what it says about the pool.
From The Big Short · 2015

Expert perspectives

From lectures, interviews and the letters investors and founders wrote.

All people →

TechniqueValuationVideo located
A capital-structure-neutral cash flow needs a capital-structure-neutral discount rate
Match the discount rate to the cash flow: a flow to all capital providers is discounted at the blended cost of all of them.
From WACC Explained · The Finance Storyteller
FrameworkValuationVideo located
A DCF is machinery for one sentence: value is the present value of expected cash flows
Every cell in a DCF is a claim about future cash or about its risk; if you cannot say which, the cell should not be there.
From Session 3: Intrinsic and DCF Valuation — Laying the Groundwork · Aswath Damodaran (NYU Stern)
TechniqueProductVideo located
A metrics question is a structured hunt: north star, guardrails, then the segment
Clarify the metric, protect the guardrails, then decompose the drop by segment until it is isolated; show the process, not a guess.
From Google Product Manager Metrics Interview: A Worked Mock · Aakash Gupta
FrameworkArtificial intelligenceVideo located
A model never sees words, only tokens, which explains most of its odd behaviour
Reason about a model in tokens: that is what it reads, what fills its window and what you pay for.
From Most Devs Don’t Understand How LLM Tokens Work · Matt Pocock
TechniqueArtificial intelligenceVideo located
A prompt is a brief: task, role, background and output format
Write to a model as you would brief a capable junior: the task, their role, the context they lack, and what the output should look like.
From Prompting 101 · Anthropic
TechniqueValuationLetter located
A sum of the parts shows what a take-private bid is paying nothing for
Value each part a bidder is acquiring; what the bid leaves at zero is the argument against it.
From Southeastern Asset Management's letter to the Dell board (February 2013) · Mason Hawkins and Staley Cates

People

Everyone →

Sources

38 books, 19 films and series, and the lectures, letters and research notes the rest of the site already reads.

Every source →

Where Atlas sits

Atlas is for discovering and connecting ideas. Primer teaches a topic from first principles with expert clips and a quiz. The Library is the annotated shelf of books and films. The labs, the models and the skills are where an idea becomes a thing you can do. Every insight here links to the one that fits.