Lesson 2 - Functions of Money
Money isn’t just something you carry in your wallet. It plays three powerful roles in every economy. Understanding these functions helps you see why money matters and how it makes trade, saving, and planning possible.
The three core functions
Economists usually describe money with three main functions. They sound abstract, but they’re simple once you see them in action:
- Medium of exchange - you can give it to someone and they’ll give you goods or services back.
- Unit of account - it’s the measuring stick that prices and debts are written in.
- Store of value - it keeps its buying power so you can use it later.
If something doesn’t do all three well, people won’t treat it as real money.
Why these functions matter
Each function solves a specific problem. Without a medium of exchange, every trade would need two people who want exactly what the other has. Without a unit of account, no one would know how much anything is worth. Without store of value, saving would be impossible.
Mini story: When money broke down
In 1923, Germany’s currency collapsed in hyperinflation. Prices doubled every few days. People were paid twice a day and ran to spend cash before it lost more value. Money had stopped being a store of value. As trust disappeared, shops refused paper marks and started accepting goods like bread or coal instead. Trade slowed, planning stopped, and chaos followed. This shows how important the three functions are. If money loses just one of them, like store of value, the whole system shakes. Once a new stable currency replaced the old one, trust came back and the economy started moving again.
Real-life examples today
You see the three functions every day without noticing them:
- Your part-time job pays you in money, not pizzas or bus rides. That’s medium of exchange.
- Shops post prices in your local currency, so you can compare products quickly. That’s unit of account.
- You save part of your paycheck for the future, confident it will still buy things. That’s store of value.
If money stopped doing any of these jobs, your daily life would get messy fast.
Summary
- Money has three key functions: medium of exchange, unit of account, and store of value
- They make trade, price comparison, and saving possible
- If money fails at any one of them, people stop trusting it
Key Terms
Further Learning
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