In the old age,few centuries ago people uses some money system which is called Barter system to buy and sell their products.This system works like exchanging their products between two people when they are in need but they realized that that system has flaws and not suitable for everyone since if there is no demand for one's product he can't buy anything he needs so later they moved to currencies (paper money) until now people uses this as their main form of payment but in digital format but people needs to understand that this also has flaw of centralization so we need to move to the decentralized money for better life.Lets get update ourselves to use the crypto currencies.
I think another evolution of money would came up a single currency that can use all over the world and some years paper money would not have a value because we are living now in a modern world or digital world we can say that after 5 years all people are just using their phone to purchase everything they wanted and many people in this era was rich unlike before.