Lawrence Summers wrote a good article in the WSJ about lack of jobs due to automation. Currency is a product manufactured by the central banks. People must work to purchase that currency. Jobs. If, for example, taxi drivers are replaced by robots, taxi drivers will not have a way to purchase that currency. Without currency, taxi drivers will be begging on the street. Many wealthy do not see this as a concern, but it is. If people do not have a way to purchase currency to purchase food, they will steal the currency from the wealthy. Identity theft and other tactics. Also. Another concern is if a robot taxi driver picks you up and a hacker decides to drive the car off a ravine, who would ever know?