One pro of a cashless society is that you don't have to carry cash. You only have to have a card or a phone, or maybe a watch with you, and you can purchase things. You also don't have to worry about change, and sometimes you can use the cashless device internationally. It is really convenient since it's so common that you can use your card in almost every store. However, if there is a natural disaster like the current situation in Ishikawa, Japan where they don't have power or the Internet, you can't use your cashless money(you can't make cashless payments/transactions). There might be some technological breakdown which prevents you from making cashless payments. I think it is important to always have a certain amount of cash with you even if you use cashless money(even if you make cashless payments) daily.