As a child, no one explained to me how to properly deal with the income that came in. That you should not spend it all within a certain period of time. You should put aside some part or, better yet, invest this money.
That's why it's considered a privilege for a child to learn the tools and skills to manage a budget, no matter how small. These methods are supposed to be learned theoretically in the early years of school, and then learned practically by observing family members (parents and siblings) and performing tasks using small amounts.