The role reversal within this play is actually just how the main character, Euclio, is constantly outsmarted by someone who should be inferior to him: a slave. Funny enough, the slave is not even known by a name in the play, but just "a slave". This indicates how low he should be, yet he had the intelligence to steal the gold from this man. Although it made the acquisition of the slave quite easy, which increases the comic value of this comedy. I think the moral of this theme is to never judge someone in advance based on their social status or even their wealth, they could always trick you or outsmart you, or even turn out to be a great person. Or they may simply want to be a free person, like this slave