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500% interest rate O.o that might just set unrealistic expectations when for so long interest rates have been at _best_ 2% on a savings account

On his saving account, i think that's a pretty good motivation to save money then to use a debit card...i thinks it's a great idea.

I think I will borrow your idea. That is about 3% per week.

I personally would go even higher, for a child a week is a really long time...maybe like a month for us old ones ;)