despite the fact that it is impossible to rely entirely on crypto-currencies, since they do not cost anything without the Internet, nevertheless, alternative monetary systems are extremely important:

Everyone needs an alternative monetary system, which clearly works and such already exist today. They are called crypto-currencies. It all started with bitcoin. Then there were a few others. I have some of them. I do not have much crypto currency, but I think that it is necessary to have it, in case of collapse of the monetary system, in this case, you can exchange money directly, even for long distances.