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A recent paper [1] argues that bipartite "PR-box" correlations, thoughdesigned to respect relativistic causality, in fact violate relativisticcausality in the classical limit. As a test of Ref. [1], we consider GHZcorrelations as a tripartite version of PR-box correlations, and ask whetherthe arguments of Ref. [1] extend to GHZ correlations. If they do - i.e. if theyshow that GHZ correlations violate relativistic causality in the classicallimit - then Ref. [1] must be incorrect, since GHZ correlations are quantumcorrelations and respect relativistic causality. But the arguments fail. Wealso show that both PR-box correlations and GHZ correlations can beretrocausal, but the retrocausality of PR-box correlations leads toself-contradictory causal loops, while the retrocausality of GHZ correlationsdoes not.

GHZ states and PR boxes in the classical limit