There is a saying: ‘rags to riches to rags in three generations.’ True for a lot of people, but not everybody, hence the existence of a class of Old Money. Old Money, in any society, may endure through the centuries for genetic reasons; irresponsible wasters born into Old Money families drop out of that social class by their own actions, a form of natural selection.
The online magazine Aeon has a good article about inequality throughout the ages, suggesting that inequality grows until major wars or plagues reset economic conditions.
https://aeon.co/essays/are-plagues-and-wars-the-only-ways-to-reduce-inequalityOld definitions of social class still hold, with the addition of a Governing class. I have read the suggestion elsewhere that any society, whether large like the US, or small like Denmark, is run by about 5000 people. This class is rich and well connected, and is above the Upper class. So:
Governing class
Upper class. A Jane Austen world of rich people living the good life on rents and dividends.
Middle class. Knowledge workers, who traditionally wear a suit and tie because they do not work with their hands. Lawyers, doctors, accountants, bankers, engineers, salesmen.
Artisan class. Carpenters, brick layers, plumbers, perhaps even electronics technicians.
Working class. Laborers.
Mechanization shifted laborers out of the Working class, and the more capable laborers became artisans, salesmen or accountants. The Working class shrank, and the Middle class grew, as we saw fifty years ago. Upper and Governing classes remained largely unchanged.
Automation cuts deeply into the Artisan and Middle class. Upper and Governing classes remain largely unchanged.
An excellent quote from Maizeman, May 26:
‘The percentage of humans who going to be able to perform productive work in a subsistence agricultural society > the proportion of humans who are going to be able to perform productive work in a manufacturing society > the proportion of humans who are going to be able to perform productive work in a white collar, service focused economy > the proportion of humans who can still be perform productive work in a world rule of robotics and AI.’
The world may divide into a minority living in advanced automated societies, and a majority living in deliberately retro societies, with mechanization deliberately restricted to sixties levels to create employment. The latter are Trump societies.