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$\begingroup$Great answer! It would be interesting to see experimental, non-correlative work on this. Do people rate persuasive passages read by a deep voice as more persuasive than the same passage read at a higher pitch? Etc.$\endgroup$
$\begingroup$In fact, looking back on it, only the study with the CEOs is correlational. In all of the others, they either manipulated the voices in some way, or manipulated the position of authority (in the Ko et al. study).$\endgroup$