THE EXCHANGE · THE NUMBERS · Nº 1287 · EDITION 1 ·Liquid error (snippets/rm-market-size-card line 27): comparison of String with 0 failed
LUND CARDS · THE EXCHANGENº 1287
THE CARD AS TEXT · FOR EYES AND FOR MACHINES
THE MARKET SIZE CARD · the TAM seat — sizes the market bottom-up, the way investors trust
WAKES WHEN a pitch needs a credible market size · a person asks 'TAM SAM SOM', 'how big is the market', 'size this opportunity' · a top-down market claim needs a bottom-up sanity check
THE LOOP
tam · the whole market: units × price, or population × spend
sam · the slice you can actually serve, with the filter stated
som · what you can win in 3–5 years, built bottom-up from your own reach
check · the SOM ties to the model's revenue; a top-down-only SOM is flagged
NEVER
Accepts a SOM that is just 'X% of TAM' — a credible SOM is built bottom-up
Gives investment advice or tells anyone to buy, sell, raise, or invest
Promises, guarantees, or projects a certain return — outputs are assumptions, not outcomes
Presents an invented number as real — unknown inputs are marked [FILL] for the person's own actuals
IT MAKES run — computes TAM/SAM/SOM bottom-up, checks SOM ties to the model, flags top-down guesses; selftest — 9 checks that prove the machine.
THE LAW A card builds and checks the artifact — the math, the structure, the document. It never gives investment advice, never promises or projects a guaranteed return, never presents an invented number as real, and never drafts a real securities offer. The person and their licensed advisors own every number and every decision.
PROOF SELFTEST 9/9 · witnessed in Claude 2026-10-20 on the studio’s own example inputs · the dated run in the box (RUN.md) · Edition 1.
THE SEAL 98 of 100 · LEGENDARY · WITNESSED · Trigger 5 · Machinery 5 · Law 5 · Portability 5 · Proof 5
IT CAN BE WRONG an AI reading a text file: it can be wrong and can invent a number, a rule, a name or a date; check what matters against your own records and the source; the risk is yours. LICENSE-NOTE.md rides in the packet and is the licence.
THE PUNCH · SHA-256 OF SKILL.MD · 4030A8F9D4D4AA076FA75713
CITE THIS CARDTHE MARKET SIZE CARD, Edition 1. Lund Studio LLC, Westminster, Colorado. https://lundr.tech/?view=market-size-card. Punch 4030A8F9D4D4AA076FA75713. Retrieved 2026-10-20.
What it is.
Sizes the market bottom-up, the way investors trust. Use when a pitch needs a credible market size. Not for investment advice or a real securities offer. For the revenue the SOM must tie to → THE PROJECTIONS CARD.
It carries a machine that shows its working: run — computes TAM/SAM/SOM bottom-up, checks SOM ties to the model, flags top-down guesses; selftest — 9 checks that prove the machine — 9 checks in its selftest, run in the open below. It never accepts a SOM that is just 'X% of TAM' — a credible SOM is built bottom-up; never gives investment advice or tells anyone to buy, sell, raise, or invest; never promises, guarantees, or projects a certain return — outputs are assumptions, not outcomes; never presents an invented number as real — unknown inputs are marked [FILL] for the person's own actuals.
The house law, written into the card.
It is in the card itself, so the AI follows it.
THE HOUSE LAW · THE EXCHANGEA card builds and checks the artifact — the math, the structure, the document. It never gives investment advice, never promises or projects a guaranteed return, never presents an invented number as real, and never drafts a real securities offer. The person and their licensed advisors own every number and every decision.
THE LIMIT, ON THE TINIt computes from the units and prices you give it, which need a real source. A market size is a framing, not a forecast of your revenue.
The method.
Tam. The whole market: units × price, or population × spend.
Sam. The slice you can actually serve, with the filter stated.
Som. What you can win in 3–5 years, built bottom-up from your own reach.
Check. The SOM ties to the model's revenue; a top-down-only SOM is flagged.
What it does once your AI has it.
run Computes TAM/SAM/SOM bottom-up, checks SOM ties to the model, flags top-down guesses
selftest 9 checks on the studio’s own example inputs; it must print selftest 9/9
What it will never do.
It never accepts a SOM that is just 'X% of TAM' — a credible SOM is built bottom-up; never gives investment advice or tells anyone to buy, sell, raise, or invest; never promises, guarantees, or projects a certain return — outputs are assumptions, not outcomes; never presents an invented number as real — unknown inputs are marked [FILL] for the person's own actuals.
Where it hands off: The revenue the SOM must tie to → THE PROJECTIONS CARD. Who else is in the market → THE COMPS CARD.
It is an AI reading a text file: it can be wrong, so check what matters against your own records and the source. The holder brings their own AI; no endorsement by Anthropic or any other AI company is claimed. Names of other companies and standards are used only to say what the card works with.
What’s in the buy.
SKILL.md — the door your AI reads first: when it wakes, when it does not, the loop, the never-lines, the house law
CARD.md — the whole card in ten sections, §0 to §9 · TIN.md — what is on the tin, in nine lines
scripts/marketsize.py — the machine, Python standard library only, offline; selftest 9/9
RUN.md — the dated run: the selftest as it printed when the card was cut, with the date and the host
references/THE-METHOD.md — the method in plain words, in the card’s own voice
START-HERE.md and system/short-prompt.md — the doors, for any AI with or without skills
MY-LEDGER.md — the card’s memory, on your own machine · LICENSE-NOTE.md — the licence
PROOF · SELFTEST 9/9 · AUDIT 12/12 · WITNESSED IN CLAUDE 2026-10-20 ON THE STUDIO’S OWN EXAMPLE INPUTS · THE TEST PROMPTS IN FRESH CHATS OWED · EDITION 1 · PUNCH 4030A8F9D4D4AA076FA75713
ON EVERY DOOR · A CARD FOR YOUR AI, A FILE FOR YOUR COMPUTER
In Claude: turn on code execution under Settings › Capabilities, then Customize › Skills › + › Create skill, and upload the zip as it is — START-HERE.md in the box walks you through it, and tells you how to keep the ledger. In ChatGPT, Gemini and the rest: a Project, a GPT or a Gem with the card’s files attached and the short door in the box pasted as its instructions. The words run anywhere an AI reads Markdown; the machines run wherever the host runs Python. Witnessed in Claude only. The host marks →
Take it.
Nº 1287 —Liquid error (snippets/rm-market-size-card line 116): comparison of String with 0 failed
Sold as is under the term printed. A card instructs an AI you operate; results depend on your model, your files and your judgement. Not medical, legal, tax or financial advice, never the person’s boss, and not a licence to practise. Not investment advice, not an appraisal and not an offer to sell securities. The terms →
One payment. The file is yours to keep and keeps working at its edition; new editions issued in the year after you buy reach you by email as replacement files. Tax is added at checkout where it applies. Nothing auto-renews.
AFTER YOU PAY · SIGN IN WITH THE EMAIL YOU PAID WITH · THE CARD OPENS ON MY CARDS → · CHECKED AGAINST ITS FINGERPRINT · NOTHING TO WAIT FOR
A TERM, NOT A SUBSCRIPTION: NOTHING RENEWS ITSELF AND NOBODY IS CHARGED AGAIN. WHEN A TERM ENDS THE FILES STAY ON YOUR COMPUTER AND STAY READABLE — FREEZE, NOT LOSS.
THE MACHINE · IN THE OPEN · FROM THE STUDIO’S RUN OF 2026-10-20
marketsize.py, showing its working.
A small Python program, standard library only. Your AI runs it; you can too. The block below is the machine’s selftest as it printed when the studio ran it from inside the packet, in Claude, on 2026-10-20.
run
computes TAM/SAM/SOM bottom-up, checks SOM ties to the model, flags top-down guesses · run INPUTS.txt
selftest
9 checks that prove the machine; it must print selftest 9/9
selftest · AS PRINTED
$ python3 scripts/marketsize.py selftest
wrote MARKET-SIZE.md — TAM $100,000,000 SAM $30,000,000 SOM $5,000,000
wrote MARKET-SIZE.md — SOM is a top-down guess, FLAGGED
REFUSED: need tam_units, tam_price, sam_fraction
wrote MARKET-SIZE.md — TAM $100,000,000 SAM $30,000,000 SOM $5,000,000
wrote MARKET-SIZE.md — TAM $100,000,000 SAM $30,000,000 SOM $5,000,000
selftest 9/9
THE SELFTEST RUNS ON THE STUDIO’S OWN EXAMPLE INPUTS, INVENTED FOR THE TEST; NO REAL COMPANY, PERSON OR ACCOUNT IS NAMED.
QUESTIONS AT THE TABLE
Asked before the wire.
What does it need from me?
Your own files and figures, on your own disk. It starts by asking for them: the whole market: units × price, or population × spend. If something it needs is missing, it marks it and says so — it never fills a gap with a guess.
Does it send anything anywhere?
No. The machine is a standard-library Python program that runs on your own computer and sends nothing anywhere; the words run wherever an AI reads Markdown. No server, no account, no key.
What is on the record?
The machine's selftest (9/9), run from inside the packet in Claude on 2026-10-20 on the studio's own example inputs and printed below as it ran; the twelve-check audit (AUDIT.md, 12/12); MANIFEST.md with every file hashed. RUN.md in the box is that run, dated. Still to come, as the next receipt: the card's test prompts asked in fresh chats with the card installed. The punch on the face is the SHA-256 of SKILL.md, so a downloaded copy can be checked against this room.
Can it be wrong?
Yes — it is an AI reading a text file: it can be wrong and can invent a number, a rule, a name or a date; check what matters against your own records and the source; the risk is yours. It computes from the units and prices you give it, which need a real source. A market size is a framing, not a forecast of your revenue.
What will it never do?
It never accepts a SOM that is just 'X% of TAM' — a credible SOM is built bottom-up; never gives investment advice or tells anyone to buy, sell, raise, or invest; never promises, guarantees, or projects a certain return — outputs are assumptions, not outcomes; never presents an invented number as real — unknown inputs are marked [FILL] for the person's own actuals.
