We don't live in a perfect global free market, but we keep moving in that direction, and more and more the Chinese worker is getting better wages at the expense of the American worker's wages (for example). This movement will only stop with national isolationist policies, or in a free market, when the workers in China reach the same economic level as the American workers, all other things being equal. It's the invisible hand!
Regarding people at the top, I still believe is the invisible hand, but certainly a glitch of the free market that runs the risk of collapsing the economic system when the wealth is concentrated in few hands. That's why most nations have progressive taxation, to reduce that risk.