There's also the idea on the other side of the coin - whereby experts on a topic underestimate how much they know about it compared to the average person.

And of course there's a relevant xkcd: https://xkcd.com/2501/

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filoleg 3 hours ago | parent [-]

Imo it would be more accurate to say that topic experts overestimate how much the average person knows about it.

	▲	falcor84 an hour ago \| parent [-]
		Sorry, I'm confused. My formulation "experts on a topic underestimate how much they know about it compared to the average person" and your "topic experts overestimate how much the average person knows about it" seem semantically identical to me, just from a different side of the relation. What nuance did I miss?