They learn how to ride a bike or jump rope. They also learn about things in school like math, science, and economics. This book will help boys and girls learn more about economics. Often there is a scarcity, because there is not enough to go around. For example, if too many trees are cut down, they will become a limited resource.
Money is earned.
Then it is saved or spent on goods and services. What you give up is your opportunity cost. The opportunity cost is the next best thingt. If you choose to play a video game instead of reading, your opportunity cost would be to read a book. Factories make goods to send to stores to be sold.