" The essential point is that a worker is also a consumer (and may support other consumers). These people drive final demand. When a worker is replaced by a machine, that machine does not go out and consume. The machine may use energy and spare parts and require maintenance, but again, those are business inputs, not final demand. If there is no one to buy what the machine is producing, it will ultimately be shut down. An industrial robot in an auto manufacturing plant will not continue running if no one is buying the cars it is assembling. "

― Martin Ford , Rise of the Robots: Technology and the Threat of a Jobless Future