I think cash is good alternative. No data collection, no surprises, just learn to count the chance you receive back and you're good. The problem I have with car

I think cash is good alternative. No data collection, no surprises, just learn to count the chance you receive back and you're good. The problem I have with cards is that money is less tangible and it is easier for kids to learn the value of money by handling coins and paper. But surely, I agree with others that this method of payment will become obsolete.