I mean yes, people regularly interact with untrustworthy (crazy/liar) people, and it is a condition for Aumann’s theorem that the people in question are neither crazy nor liars. I was interpreting Stephen Bennett to point at the stronger aspects of the condition (common knowledge technically being a very strong condition), but maybe that wasn’t his intent.
I mean yes, people regularly interact with untrustworthy (crazy/liar) people, and it is a condition for Aumann’s theorem that the people in question are neither crazy nor liars. I was interpreting Stephen Bennett to point at the stronger aspects of the condition (common knowledge technically being a very strong condition), but maybe that wasn’t his intent.