turnlizer replied to your post: Buffalo people buffalo people

but couldn’t people people people people people? and what if the people people were fond of other people people (à la “dog people”): people people people people people people.

Yes, people people could people people people.  In fact, you can throw relative clauses in and get any string of “people” you want (greater than two) and it will be licensed by the grammar.

But, I would say that a person fond of people people is not a “people people person” but rather a “people person person”.  You’re not a “dogs person”, are you?

So: 1) “People people people” or 2) “People person people”?