It is a zero sum game over short timescales. Over long timescales the situation is actually worse since the more money you have, the more you can make. So who

It is a zero sum game over short timescales. Over long timescales the situation is actually worse since the more money you have, the more you can make. So whoever starts with a small advantage ends up with a huge advantage, and whoever starts out behind might fall into poverty and end up with nothing. Wealth redistribution of various kinds- governmental and otherwise- is all that keeps the system stable at all.