Thank you for your reminder. :)
Any discussion of tactics in answering this question is in part an affluent person’s conceit. In families that don’t have enough money to provide everything kids need, income and expenses are an everyday reality that is part of the air kids breathe.
There, children will usually know sooner rather than later what the constraints are, what it takes to live within them and how older children might help make things easier.
It is obvious that kids will spend a couple of decades figuring out how the world works. :)