If you were a plumber, or an accountant, and you "lost your job" you might go to an employment agent to find another job doing the same thing.
Now, if you are working, you are doing more kinds of work, and
(per Tom Peters):
'Those who believe their job descriptions are dead!'
The biggest employer in the world is Adecco. The next largest is Manpower, Inc.
Five of the ten largest employers in the world are
personnel supply companies!