The foundation of this question is a bit vague (based on something overheard at a conference) but I'm hoping someone here can provide some clarification.
I overheard a conversation between two people at a conference saying that signaling doesn't really make sense in zero-sum games. Unfortunately, I don't have much more context than that.
I have continued to think about this statement and really can't figure out why it ``doesn't really make sense.'' The zero-sum aspect only talks about the payoffs, where the signaling aspect is concerned with how information is revealed as a function of the players' actions. I don't see why a game being zero-sum should preclude signaling.
Question: Can signaling occur in zero-sum games? Please provide a link to a paper/example if so.