This is a very idealistic approach. There are industries which have not produced a dime of revenue for many years and keep existing and employing a lot of peop

This is a very idealistic approach. There are industries which have not produced a dime of revenue for many years and keep existing and employing a lot of people for political reasons. Even in sectors actually governed by the free market, what you say only has to be true on average. As a software engineer I know I have worked at places that produced no value whatsoever to anyone. Once I wrote a Perl script that immediately saved the guy I worked for something in the neighborhood of my monthly salary per day. That was the only time in my life that I could actually say that I understood how my work translated to money. Usually you just write code which is a small part of someone's great plan which in a few years time may go somewhere or not depending on things that are outside of your control.