How was inequality between people manifested?

Such a phenomenon as inequality between people has existed for a very long time, and it began to emerge many thousands of years ago. Most often, such inequality is highlighted in the class division of the population, that is, there is a privileged class, middle and poor. The whole point of the difference is who has the most access to power and income. The most negative thing in this situation is that the representatives of the poorest stratum are the most, and therefore, the negative changes in the country are felt by people with low incomes, and not by the middle and especially the richer class.