Traditional machines, like this water powered mill, supply brute force for tasks like grinding corn and pulling heavy loads. Each of these machines is much more powerful than any man. They eliminated lots of jobs that involved life-shortening brutal labor for unskilled workers.
Modern automated machines (like computers and telephones switches) can perform repetitive tasks much faster and with fewer mistakes than any human. They are eliminating lots of boring jobs.
There are no machines that threaten the jobs of people who are creative thinkers and decision makers. For people with these kinds of occupations, machines are tools that let the people do their own jobs better and faster.
