Phrase Study 6.in sb's/sth's favor:to sb's/sth's advantage The plan has this in its favor,that it won't cost much. The system tends to operate in favor of the wealthier classes.Phrase Study 6. in sb's/sth's favor: to sb's/sth's advantage The plan has this in its favor, that it won't cost much. The system tends to operate in favor of the wealthier classes