Class differences are inherent in human society because some people are just more hard-working and/or smarter and/or better educated and/or just luckier than others.

I became convinced of this upwards of sixty years ago (I was 12 or 13 at the time) from a reading of J.B. Bury’s HISTORY OF ANCIENT GREECE. He related how one of the Greek city states, I dont remember which, undertook to abolish such differences by confiscating all land and redistributing it to families in equal parcels. Notwithstanding all the efforts made by government to maintain this equality, by the third or fourth generations some families had managed to overtly or covertly
accumulate much larger parcels and some had little or no land left.

After the Tokugawas became all-powerful, at least some of the Outer Lords were subjected to a radical experiment which undertook to abolish wealth differences by confiscating all land and redistributing it into equal parcels. Notwithstanding every measure the Tokugawas could devise to prevent this being sabotaged, and to maintain equality, by the third or fourth generations some families had managed to overtly or covertly accumulate much larger parcels and some had little or no land left.

Once again, the families that emerged with the large-parcel were
not necessarily the same families as had had larger parcels before redistribution. In many cases harder working or smarter or luckier new families had ended up w/ the much larger parcels. But the fact remained that by the third or fourth generations stratification had recurred: some families had ended up w/ much larger parcels while others had little or no land left. And this was despite all the efforts the Tokugawas had lavished on laws designed to prevent it happening.

A little known (to Westerners) fact about the USSR: In about 1931 Stalin denounced the idea of equality as bourgeois objectivism. The eventual result was the most intense system of class stratification ever seen – all in the service of the state. All stores were government operated and organized in strata of their customers’ importance to the state. The base stores served the general populace. They had severely restricted quantity, quality and variety of goods. Then in rising levels of quantity, quality and variety of goods, came progressively more exclusive stores. Ordinary people could not gain access to the various ranks of higher quality stores. These served athletes, bureaucrats and military officers according to the various levels of priority given them.

Economic differenceS reflect the fact that some people are just luckier or more able and/or more hard-working than others. If you think this is unfair -- blame God.