When I think or discuss social class I usually am actually thinking socioeconomic status which includes not only income but education level and within each class we see different psychographic generalizations that can me made (attitudes, interests, activities and lifestyles). Of course these are generalizations and there can be crossover.
Wikipedia has a table with a few different ways to define social class. I’m going to look for generalizations of socioeconomic and pschographics to link on a later post. My computer is giving me trouble, and I keep losing what I have written, so better I do it on a separate post.
The psychographic information is important because it goes to what people have in common and what they do in sa time. Two families might both make $75k a year. The one with the higher education might be more likely on their free time to play tennis, travel out of the country, art museum, or see a play; while the other family might be more likely to fish, go to a baseball game, have an average of 3 kids, not own a passport, etc. I totally made those up, and of course, again, there is crossover. The more money people have, the more they can afford to do expensive activities like skiing, golf, and international travel.
At the same time an educated $75k family might do the same activities as a $150k family, because money is not everything, it’s complicated. And of course formal education level is not everything. People can be extremely knowledgeable and exposed to and interested in the same things without a formal education. My inlaws have 5th and 8th grade educations, they have travelled all over Europe, but they also were part of the upper class in their country, Mexico, because they made good money and the classes, especially then, were basically you were upper class or lower, with a very small middle class.