Yeah, the day my daughter told me just 'buy it off the internet' when I told her I didn't have money to buy the thing she wanted was the day she started having her own money.
When she went to buy some sweets etc at the shop with cash she would have to tell me the price of it and wether we had enough money in her hands etc. I think a lot of the Brave New World let's get rid of cash folks don't realise how abstract the concept of value and purchasing is and physical cash is a very useful tool in teaching that.
Perhaps we might need some physical Bitcoins after all 😁