The issue is personally clearer with friends: most of us have friends (or ex friends) who are comparatively much better off or much worse off. It leads to weird strains, especially if the friendship is between male and female.
Different people have different norms about money. It becomes especially fraught if there is any sort of status contest going on.
I can see why people tend to group their friendships by their income (not just due to selection effects). As you get wealthier it is just more effortless to hang out with other people with similar means. I doing think it is just a status issue (although presumably that has song influence too).
The article talks about wealth differences, but it would have been more interesting to also look at what happens with large status differences (artist musician sportsperson etc).
Different people have different norms about money. It becomes especially fraught if there is any sort of status contest going on.
I can see why people tend to group their friendships by their income (not just due to selection effects). As you get wealthier it is just more effortless to hang out with other people with similar means. I doing think it is just a status issue (although presumably that has song influence too).
The article talks about wealth differences, but it would have been more interesting to also look at what happens with large status differences (artist musician sportsperson etc).
https://archive.ph/vZsiX