Last time I checked, we have only one pie called planet earth and some of it is renewable and some of it is not. So just there is a valid discussion about how the pie is divided.
Resources are limited (assuming we stay on earth - not a valid assumption). Wealth is not, because wealth (value of possessions) is subjective, because value is subjective. If you have a car, and want a painting, and I have a painting, and want a car, when we trade, I am getting something I value more than what I am giving up, and you are getting something that you value more than what you are giving up. When the trade is completed, we are both wealthier than when we started. Wealth is created by free trade, and destroyed by aggression - either directly, by damaging or destroying things of value, or subjectively, by forcing someone to give up something they value more for something they value less.
Which explains why socialist regimes impoverish their peoples.
You don't understand everything.