Re China, I believe there is misunderstanding. China has free market economy, but China does not have big oligarchs running the country, the opposite of US.

In China, political and economic leadership are separate. Country is ran by the party, while economy is ran by small-med-large companies fiercely competing among themselves. Any oligarch trying to get political influence is quickly shut down (jack ma).

USA on the other hand are fully ran by the oligarchs, every single politician is beholden to special interest groups representing the big corporate capital, and nobody cares about the common man. Anyone trying to break into power representing the common man, at the expense of the big oligarchic capital, is quickly shut down (bernie)