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. Due to centralization of the distribution system (eg. Wall Street and Washington DC), 90% of the population does not receive sufficient product (currency). People are forced to work to purchase that product. That requires 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?
I reverse-engineered the idea of money and arrived at the solution to all of the above problems (described below).