Which concept explains the fact that even long-dead actors are connected with Kevin Bacon in the "six degrees of separation" game?

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The concept of "small world" explains the phenomenon behind the "six degrees of separation" game, which suggests that any two people on the earth are connected by no more than six acquaintances. This concept applies to Kevin Bacon's game as well, where even long-dead actors (who might not have worked with Bacon) can be connected to him through a chain of six or fewer acquaintances.

Which Concept Explains the Fact That Even Long-Dead Actors Are