Thus his comment on "limiting purchases for finance lessons". Give them a budget, let them do what they want with it, teach them that impulses are controllable and that there are tradeoffs, etc.
This is a trend I've been noticing, which doesn't seem very surprising when written out. Parents who try to approve every purchase end up in a never ending onslaught of requests compared to parents who simply give their kids money and let them spend it however.