I like this definition, but I think our society cannot be meaningfully represented in 3 classes anymore. Someone might not be able to live off interest income a

I like this definition, but I think our society cannot be meaningfully represented in 3 classes anymore. Someone might not be able to live off interest income alone, but they might own a small internet company which makes them a few million dollars a year. These people can walk into a shop and buy a Tesla with cash without even having to think about it twice, but they wouldn't be able to buy a £45 million penthouse apartment in Singapore like the Dyson guy did recently. I would certainly classify them as upper class, but then there is probably at least two more classes above them.