What happens when demand goes up?

When demand goes up, more people want something, and that makes it cost more or become harder to get.

Imagine you have a favorite snack at school, let's say chocolate chip cookies. One day, only you want them. The teacher can just hand you one without any trouble. But then, all your friends suddenly love chocolate chip cookies too! Now demand has gone up, more people want the same thing.

• Prices go up: If there are not enough cookies to go around, the teacher might say, "Each cookie costs an extra penny now." That’s like how prices increase when demand goes up.
• Supply gets busy: The teacher has to make more cookies or get them from another class. This is like how stores have to work harder to give you what you want, sometimes it takes longer to get it.

It's just like when everyone in your family wants ice cream on a hot day, the freezer might be empty faster, and you might have to wait for more ice cream to come!