It's pretty tough to figure out if there's over-exposure in index investments, and tougher still to untangle the expected fallout of that problem, if it exists. Some people have talked about it, and have been shouted down of course.

I've done a decent amount of reading on the topic and think I'm barely knowledgeable about the surface of it. I guess that's how it always is, though.

People burying their heads in the sand and thinking that index investing has no hidden black swans are the ones to be most scared of, though.