There are advantages and disadvantages of having a cashless world...The good thing is that there will be less tax evasion given that most tax evasion occurs with cash. That is the main reason why Modi tried to move to less cash society in India. The additional tax revenue will help the economy and fund other government programs that will hopefully help society. Plus, it makes the world more equitable as everyone pays taxes.The bad thing is that there will be less privacy. Now someone may know what you like to buy and when do you buy it. So there will be limited privacy in your consumption.However, let us remember that we have cryptocurrencies that will keep things private. And also, there will always be some sort of cash because electronic systems will fail time to time. So always good to have cold hard cash...