[TFYS]

Yes, not all things are zero-sum, but enough are that inequality really does matter. Take labor for example. There's only a limited number of skilled people. Who do those skilled people work for? The people that can give them the most money. So, instead of using their skills to build farms, housing, schools and other things that benefit a large number of people they use their skills to build yachts, mansions and manipulation algorithms. Demand from those with wealth increases the price of skilled labor to the point where people with no money can not afford it. Skilled people from poor communities move to the places where the rich throw their capital around, work on things that the wealthy think are important, and the communities they leave behind suffer as a result.