Real money has accompanied people for thousands of years, and for good reason. Cash is almost untraceable, easy to carry, accepted everywhere and reliable.
If electricity goes out or the electronic system that powers online commerce around the world fails, cash comes to the rescue.
If someone wants to buy something so that the payment doesn't lead to the person itself, cash is the best choice.
Even despite the advances in modern technology, some of the properties of cash can't yet be reproduced in the smallest detail.
Now there is simply no alternative payment system that is as convenient, reliable and anonymous. Bitcoin cryptocurrency is anonymous, but so far it is too unstable and inconvenient. Mobile payments systems between individuals, such as PayPal, require apps and invoices, and are still easy to track.
In addition, the issue of global reliability is important. For example, two thirds of savings in United States dollars existed abroad. People roll cash into cups for emergencies, keep it as insurance and make sure that they always have a birthday wad of cash at their disposal in case of any surprise.
Though the modern technological civilization and tries to develop system which would possess all properties of cash, it has not yet succeeded. That's why, as the statistics on the use of cash around the world shows, paper money and coins is still have a great demand.