When one studies Econ 101, which in most universities, is Macroeconomics, there is a fundamental principle which must be acknowledged.
In it's simplest form, the principle states, "There will always be more of us, than there are of you."
All economic systems tend to accumulate more wealth, property, and power in the hands of fewer people. This doesn't matter if it's a King, a Corporate CEO, or a Communist Party Boss. Economics is a social science, because it is the study of cooperation between people. For any society to exist, the people must be relatively content. The great threat to any society is the possibility that discontented people may decide to stop cooperating. This gets very messy. Doors get kicked in, rich people get killed, and all their stuff gets scattered all over the place.
For this reason, economies are regulated. Economic regulations are intended to maintain and equitable balance between those with little power and those with a lot.
Capitalism is attractive, because it is very efficient at collecting resources and distributing them through out the population. It is based on the concept of private property. I can own something and spend little of my wealth protecting it, because we all agree that is mine. If someone steals from me, I can count on society to back me up when I want to get it back.
This is a problem for people who own nothing. They have to work for me and I pay them a portion of my increase in wealth. If there happens to be more workers than I need, it sucks for them. They just have to make do with less. Of course, if I exploit their numbers and decide to keep more of my increase, I run the risk of losing their cooperation.
It's easy to forget, the only reason I have so much stuff, is because they said I could keep it. Economics is not theology. There is no God in economics. Given the choice between starvation and killing me and taking my stuff, the latter always wins.
As I said, there are always more of them, than there are of me. If I want to keep my stuff, I must maintain a balance between getting as much stuff as I can, and having so much stuff, other people will kill me for it.