Money & Economic Foundations
You use it every day. What is it?
Coins, notes, a card, a number in an app — those are all just shapes money takes. The idea underneath is older and much simpler.
The problem
Try buying bread with eggs.
You have eggs. You want bread. Go and get it.
🥚 Your basket: eggs · Your goal: 🍞 bread
ASKED 0/6Pick someone in the market and offer your eggs.
Nobody in this market both has bread and wants eggs. The tailor wants your eggs but hasn't got bread. The baker has bread but wants shoes. Both sides of a swap have to match at the same time — that requirement is called the double coincidence of wants, and it's the wall barter keeps hitting.
Neither person had to want what the other was holding. Money split one impossible swap into two easy ones — and that's the whole trick.
The definition
Money does three jobs at once.
Tap each one. If any of the three weakens, the whole system loses quality.
Hands on
Why barter can't scale.
Drag the number of goods up and watch the two systems come apart.
exchange rates
prices
One shared unit turns a web of pairs into a single list. That's money working as a unit of account — it doesn't say what's valuable, it just makes everything measurable on one scale.
Where it breaks
All of it rests on trust.
Money works because people believe it'll still be accepted tomorrow. Take that away.
Trust is holding. Money is doing all three jobs.
What good money needs
Five properties, one reason each.
These are why societies kept changing what they used as money.
Check yourself
Five questions.
Answers come straight from this lesson. Submitting completes it.