I want to reply here for the header more than actual article. Well, Today era is definitely the era of digital everything. But in case of money, well, I still prefer physical money than the electronic way of payment. Why? it is simple. If you have a card or bitcoin card wallet, or any other digital payment method, you will more likely to spend more money. It is simple as beeping your card on terminal. If you do that, it is easy, so much easy that your brain not always process the amount of money you are spending at the moment. But if you hold the actual money, like medium or high value notes, you in your mind don't want to give them away, because at the moment, you realize, that you are going to give away large notes, large amount of money you are holding. So yes, there is a future in digital payment, but still, physical money should play its role in everyday life so the people can actually control their money. Just ... little bit philosophical and psychological topic :)