I've been wondering if the popular theory that type 4 and 5 are rarest is actually true or not, and I found multiple academic sources proving that 4 and 5 are in fact the more populous types:
According to this Turkish research paper...
I'm doing some research on how personality (measured by MBTI) affects consumer behaviour.
Would anyone happen to know the best academic books/articles/authors etc. who have researched this topic?