Learn / Part 1 · How Money Works
The Language of Money
What are the words and numbers that money decisions are built from?
In brief
Money has a small set of building blocks: income, spending, assets, liabilities, interest and risk. Once you can name them and connect them, product pitches become much easier to read.
Key ideas
Flow and stock
Income and spending are flows over time; assets and debts are stocks at a moment. Wealth is a stock, built from the gap between two flows.
Make an insight card →Net worth is a snapshot
What you own minus what you owe says where you stand today; the monthly margin says where you are heading.
Make an insight card →Language protects you
Many costly choices hide in jargon. Knowing what a term means is the cheapest protection there is.
Make an insight card →Try it
Margin & net worth
Two numbers describe any financial life: the monthly margin (a flow) and net worth (a stock). Income alone says neither.
Open the full page: formula, variables, worked example and cautions →
Red flag
A product described with many technical words and no single plain-language price.
Ask before you sign
- What exactly is the total I will pay, in money?
- Can you explain this in words, without the jargon?
Do this week
Write down your take-home pay, your fixed commitments and your everyday spending for one month.
Try it · 10–45 minutes
List everything you own and owe on one page, then add them up. Round numbers are fine.
See it in a life
Cases that bring this chapter to life
Connected ideas
Where else this shows up
Pause and reflect
Private to this device. Nothing is sent anywhere.
Words worth knowing
- Net worth
- Everything you own minus everything you owe, at a point in time.
- Asset
- Something you own that has value: cash, investments, property, a business, a pension.
- Liability
- Something you owe: a loan, a card balance, a bill.
- Income
- Money received, usually per month or year, before or after tax. Always check which.
- Monthly margin
- What is left of take-home pay after commitments and everyday spending. The raw material of wealth.
- Interest
- The price of using money: what a borrower pays and a saver earns.
Companion notes written for this website, based on the topics of Chapter 1. They explain ideas and do not reproduce the book. General information, not personal advice.