We Need Chocolate Milk

Conversation with my four year old: 

Can we get chocolate milk at the store?

Maybe, sometimes it's expensive. Do you know what expensive is?

No.

It means it's more money than regular milk.

Do you have more money than regular milk? 

Probably. Sometimes you save your money 

for things you need and not spend it on things you just want.

.....We need chocolate milk.