The book publisher AB Publishing tells how to become an indispensable worker. This gives a lot of privileges, bonuses, and most importantly - promotes career growth.
Irreplaceable employees subsequently become managers, often open their own business. It's not easy to work, but who promised that it would be easy? But the return on effective work is enormous. Tired of your favorite work is the most pleasant. And the close people of a successful worker are valued and respected.
And what else is necessary for happiness?
Irreplaceable workers love everything!