A mini-company: what you sell

One thing to sell. Not an empire.

A mini-company at school is one thing you may sell by a teacher. Lemonade, a biscuit, a sticker. It is not a trade. It is not crypto. It is not a pyramid. Till boss teaches three numbers: cost, a price, profit. Not a hunt.

A preview of the level. Stall rules will come. Today: what and why.

Adam: 12 products and an NFT. Ema: lemonade, a teacher yes. Adam has an empire in a head. Ema has a cup that can carry a day. The course takes a cup.

One thing, school doors

学校 is a door. With no it a stall is a trap for a corridor and for allergies. A teacher: what, where, when, allergens, money where.

Sceptic: no prize with a purchase, no team for entry. Shopper: an honest unit. Planner: a ceiling of buying supplies.

You are not a director. You are a team member with paper. IČO a school has, or none of you. A child’s email onto a company no.

Ema wants to shorten it to “it will be fine somehow”. Adam asks what the lesson A mini-company: what you sell is for, when a table can do a sum. A sum does not count respect, a PIN, a trap or an envelope. The core is: A mini-company = one allowed thing. Not an empire, not IČO, not a chat.

Adults pay the rent. The card, the account and the PIN belong to a parent. A child’s email does not belong here. Pocket-money numbers do not belong on the network. If you break these rules in the lesson “A mini-company: what you sell”, you know a word, not the course.

X = lemonade. Not X = V-bucks (forbidden, a stranger brand). Not X = a lottery ticket. Ema. Adam V-bucks. Stop.

Practice numbers, not a bank statement. Ema has 80 Kč in the want envelope. Adam pushes a step this lesson can name. When Ema uses the core, either it waits for a parent, or it fits the envelope. If not, anger and a hole are left — proof of pressure, not that the lesson is pointless.

Why this right now

You are in the course Money with Martin, level Till boss. You can write numbers in a notebook or a table, but the topic is money and decisions, not Excel formulas. The account, the card and the PIN belong to a parent. A child’s email does not belong here. Do not put pocket-money numbers on the network.

This is not the Sheets with Martin course. A table may help, but the mark of success is a decision, not SUM.

You will know this lesson by one sentence: A mini-company = one allowed thing. Not an empire, not IČO, not a chat. When you can say it to a parent or a teacher, you have the core. The rest is practice, not magic.

Cost and profit need X. With no X three numbers are fog. With X they can be counted.

If you skip this, the next lesson in level Till boss will stand on fog. An X sentence exists. An empire and a gem on the no. Permission today was not needed — paper yes. It is not a test for marks. It is a safety net, so “A mini-company: what you sell” is not only a heading.

Four things you will build from the course

The course has four small projects. You do not have to do them all at once. Today you add only what this lesson can do.

Workshop: an X sentence

Practice X lemonade. It is not permission to sell today. It is paper.

1. A sentence X + a teacher allows.

2. A no list: crypto, a lottery ticket, a gem, a pyramid.

3. Allergy in one word (ask a teacher).

4. A child’s company email no.

You count with one X. Twelve X is Adam’s empire. An empire falls on day one.

Pocket money: Do not mix pocket money with takings. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

Class trip: A trip: a stall only when a sheet allows. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

Game shop: A game: do not sell a gem. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

Stall: This IS the seed of a stall. Do not write someone else’s amount, a PIN, an IBAN or “how much a classmate gets” next to it. A rule and a practice number are enough — or an honest zero.

What to tell a parent with no wage and no account number: “Today I went through a mini-company: what you sell — A mini-company = one allowed thing. Not an empire, not IČO, not a chat.” If they have no time, a slip in the notebook is enough. Stories and class chat are not enough.

One X. If you cannot see this, let the next lesson wait. It is not shame. It is a hole in the chapter, not in you.

A teacher doors. If you cannot see this, let the next lesson wait. It is not shame. It is a hole in the chapter, not in you.

IČO and a child’s email no. If you cannot see this, let the next lesson wait. It is not shame. It is a hole in the chapter, not in you.

Three nos here too: do not chase a ranking, do not bypass a payment lock, do not carry blame for rent. When someone hurries for a code from an SMS, those are Banker and Sceptic doors, not a workshop in a rush.

Practice: X, or an empire?

What passes school?

1. Lemonade, a teacher. Yes?

2. An NFT and 12 things. No why?

3. A sale in the toilets. No why?

4. V-bucks. No why?

Now you 💪

Go through three checks. By each one, tick in your head: do I see it, or not?

1. One X.
2. A teacher doors.
3. IČO and a child’s email no.

If something is missing, go back to the steps above. It is not a test for marks. It is a safety net, so you go on with certainty, not with a mess.

What to take from this lesson

• One thing.
• 学校 doors.
• Not a trade from a DM.
• Takings ≠ pocket money.
• 名前s in the examples (Ema, Adam) are made up. Do not put your number, email or photo here.
• Next lesson: When you can do this, go to the next lesson in the same level.

© 2026 Ing. Martin Polak / AlgoRhino · コンテンツ利用規約