A limit on paper, not in the head at the till
Shopper’s project: a list + a ceiling in Kč. Three to five things. A want or must envelope. At the till (or at a machine, or at a game price list with a parent) you reach only for the list. What is not on paper waits until tomorrow.
A limit is the balance you may. Not a family wage. Not rent.
Filip: “a list in the head”. At the till chocolate, a bar, the limit dead. Eliška: paper, a ceiling 60, three things 18+22+15=55. Chocolate off. No. Filip laughs at paper. Eliška has 5 reserve. The laugh was pressure.
Add the list before the shop. If the sum > the ceiling, cross out a want, not must. The unit from the first lesson, when you compare two brands.
Paper is a lock on a mood
A head at the till is weak. Paper is strong, because a calmer head wrote it. That is not weakness. It is design, like a PIN with a parent.
A list may contain “nothing from a game” as a rule. Then a lobby does not order a row.
A discount on a thing off the list is pressure with a percent. Step 3: would I want it with no sign? And is it on paper? No + no = no.
A parent at a big household shop. You practise a small list. Do not mix. Your 60 is not buying a fridge.
Eliška wants to shorten it to “it will be fine somehow”. Filip asks what the lesson Project: a shopping list with a limit 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 list and a ceiling before the till. What is not on paper waits.
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 “Project: a shopping list with a limit”, you know a word, not the course.
A ceiling 60. A list: a pen 19, a notebook 25, a roll 6 = 50. A reserve 10 for rounding and a lie of the eyes. Filip with no reserve, the till 62, awkwardness or a loan. A reserve 10 is Shopper.
A game variant: a ceiling 0. An empty list. A pass off. It counts. The project does not have to buy.
Practice numbers, not a bank statement. Eliška has 80 Kč in the want envelope. Filip pushes a step this lesson can name. When Eliška 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.
Do not photo a list with amounts into class. A limit is privacy. And do not let a friend add rows for you at the till.
Why this right now
You are in the course Money with Martin, level Shopper. 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 list and a ceiling before the till. What is not on paper waits. When you can say it to a parent or a teacher, you have the core. The rest is practice, not magic.
Regret tomorrow hurts less when paper held. The lesson on regret needs something to stand against. A list is against.
If you skip this, the next lesson in level Shopper will stand on fog. Paper with a ceiling and three rows exists. The sum holds. The limit is not on the network. It is not a test for marks. It is a safety net, so “Project: a shopping list with a limit” 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.
🪙 Pocket money
A 14-day record: income, spending, balance. What you do not write down is as if you did not spend it — and that is a lie.
Pocket money 14 days: one day with a list. Compare with a day without.
🚌 Class trip
A budget, a reserve, a plan B. A shared till has rules.
A trip: a souvenir list with a ceiling from the till — Planner will follow.
🎮 Game shop
V-bucks and a loot box are a purchase. A subscription keeps going.
A game: a list “nothing” is a valid project.
🧾 Stall / mini-company
Cost, price, profit. Three numbers for the class.
A stall: buying supplies with a list and a ceiling. Otherwise profit dies in a shop.
Workshop: a ceiling and three rows
A practice ceiling 60 Kč or your want. A purchase does not have to happen. Paper yes.
-
A ceiling. Three rows. A sum. A cross-out if > the ceiling.
-
A reserve of at least a few koruna for rounding.
-
A rule: off paper = tomorrow.
-
Show a parent the paper, not stories. Go to a real till only with them, or practise at a machine in the limit.
You count when the sum ≤ the ceiling and the rule off paper exists. An empty purchase with a list “nothing” is a finished project, not boredom.
Pocket money: Pocket money 14 days: one day with a list. Compare with a day without. 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 souvenir list with a ceiling from the till — Planner will follow. 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: a list “nothing” is a valid project. 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: A stall: buying supplies with a list and a ceiling. Otherwise profit dies in a shop. 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.
Practice: on paper, or at the till?
What passes?
-
A ceiling 60, a sum 55, chocolate 20 off. What?
-
50% off a thing off the list. Two filters?
-
A list in the head. Why does it weaken?
-
Why does a photo of a list with a limit into chat spoil privacy?
Now you 💪
Go through three checks. By each one, tick in your head: do I see it, or not?
- I can add before the till.
- Off paper waits.
- An empty purchase may be a success.
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.
Check: Paper with a ceiling and three rows exists. The sum holds. The limit is not on the network.
What to take from this lesson
- Paper is a lock on a mood.
- A ceiling from an envelope, not from rent.
- A discount off the list is pressure.
- A list “nothing” counts.
- 姓名s in the examples (Eliška, Filip) 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 · 内容使用条款