?1 a week (4 year old). Every so often we get it out and count it and put the total in 'book' when she really wants something i'll put the price in the other side of the ledger and we can do basic accounting, learn some maths (and deffered gratification) and give her some basic financial skills (ie value of saving etc) that sometimes it seems many adults lack. I didn't get to grips with finance until my 30s until then I was ripped off, stupidly advised and had stupid (although not catastrophic) debts. I want my kids to be financially aware as early as possible so this seems a fun way to help them learn the value of money and saving.