If the pot of money was endless, why shouldn't we give 1 million$ from it to each person on Earth?

The money would loose all it's power if it was unlimited. It's the basic principle of the demand and the offer.

So yes, a person always get richer on the back of another.

>Why should there be a limit? Talk like this suggests that there is a finite pot of money out there and if one person earns more money then another must make less. This is not the case. Unlike the cattle-futures market, the world economy is not a zero-sum game.