The 1996 book "The Millionaire Next Door" covered this a bit. Lots of contrast between doctors and similar who spent all their income on expensive houses, cars

The 1996 book "The Millionaire Next Door" covered this a bit. Lots of contrast between doctors and similar who spent all their income on expensive houses, cars, club memberships etc and people who owned blue collar businesses who bought in similar/more income but lived modestly. https://en.wikipedia.org/wiki/The_Millionaire_Next_Door https://en.wikipedia.org/wiki/The_Millionaire_Next_Door