Principles of Politics
I think the divide of power between wealthy and poor, at least in the West, is largely overstated. Wealth alone cannot force a poor man to do anything, and vice versa. In fact, the rich and poor often engage with each other in consensual, common enterprise, whether through employment or other contracts.
No amount of wealth can enslave you or I because the wealthy do not possess a monopoly on violence. The wealthy are subject to the same laws, and, at least where the law is faithfully executed, the same punishments. So I cannot see how the wealthy are the “masters of mankind” when they are unable to force mankind to do anything.
Rather, we must look to which class has expropriated the means of political organization and domination, and have convinced us of its legitimacy. These people can force us to give it our earnings, can imprison us if we disobey, and kill us should it choose to do so.
This master is the state.
“The State, completely in its genesis, essentially and almost completely during the first stages of its existence, is a social institution, forced by a victorious group of men on a defeated group, with the sole purpose of regulating the dominion of the victorious group over the vanquished, and securing itself against revolt from within and attacks from abroad.”
https://oll.libertyfund.org/titles/oppenheimer-the-state