Earlier quoted context omitted.
As a childhood lesson you don't need crazy inflation for this to hold true though. Anything that takes more than a few of months to save up to just doesn't make sense as a kid. Your disposable income goes up by factors of ten every few years. You have 2$ to spend at 5, 20$ at 10, 200$ at 15. Then it slows down but you might still get to 2000$ at 25. Saving as a kid really never seemed worth it to me.
It's about the lesson more than anything else. I really want my kids to learn how to save and be well practiced at it, even though the utility function doesn't make a ton of sense.
SPEND: They are encouraged to spend 1/3rd of the money. Whatever they want to buy. They have become online discount shopping experts, whether getting rubiks cubes, roller blades or harry potter merchandise.
SAVE: 1/3rd goes into savings, which we will let them tap once they need it. Not sure when: once they are 17/18 perhaps? In all cases, it will be a big payout compared to the amounts they are used to "spend".
CHARITY: And 1/3rd goes to charity envelop. So whenever an opportunity comes up, they can use that towards any charity event. Good thing is that they usually spend it all in one go. Great!