The conservation of energy
I can't find the article, but it was about austerity in Greece.
10% of the workforce is public sector, and they are raging mad. One opined that cutting them would reduce tax revenue generated for the government. I would argue how much.
It reminded me of a great childhood idea that I had. Why not put an electrical motor on the engine of a car, that way the car could generate electricity while driving; hence no gas would be needed. You could drive forever. It was a fine idea for a 7th grader, but I did learn about the conservation of energy later in my education.
Anyway, the point is that the private sector creates tax revenue for the public sector to consume. Public sector employment is necessary of course, but it is not self sufficient (I suppose that this is where tax the rich comes in lol). The conservation of energy applies.
And if you don't agree, that's fine. I've enjoyed telling you about my great childhood idea.