Imagine you are dying of thirst in a desert. The first glass of water is worth millions to you because it saves your life. If someone offers you another glass, you say yes easily. But if they offer you a third, fourth, or fifth glass while you are already full, you might not even care about them. The extra water isn't special anymore.
Now think about diamonds. They don't keep you alive. But because there aren't many of them, getting one feels rare and exciting. We pay for the next diamond we get, not all the diamonds ever made.
Why Water Is Cheap
Water is everywhere. When there is so much water that it spills over its banks, the extra drop has almost no value to us. We use it for drinking, then washing dishes, then watering plants. Each step makes the next drop less important.
Why Diamonds Are Expensive
Diamonds are hard to find. Because they are rare, we always want just one more. The excitement of getting a new diamond is high because we don't have piles of them lying around.
So, water has great total value because it keeps us alive, but its price is low because we have so much of it. Diamonds have less total value for survival, but their price is high because they are scarce and special to each of us.
Examples
- Buying a new toy car when you only have two is exciting, but buying the fifth identical toy car is less special.
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See also
- How Did Money Start and Why Do We Still Use It?
- How Did Ancient Coins Influence Modern Economics?
- How Did the Invention of Money Change Society?
- How Do Taxes Actually Affect Our Daily Lives?
- How do economists predict recessions?