It is also used to distinguish between a person's different roles in life.
Value is created through exchange and the relationships between roles.
The crucial difference between the media's power over government and its more limited role in politics is paid advertising.
It was like talking to an eight-year-old who couldn't tell the difference between an actor and his role.
The firm has produced a comparison between the lawyer's role today with that of his 18th century counterpart.
The dichotomy between her roles as mother and doctor seems historically difficult.
He divided his time between this and his role as secretary of the Institute.
She says there is no apparent conflict between his role as parent and manager: "He makes sure that we have both relationships."
Charles struggles to make sense of the dreams, torn between his role as father and psychiatrist.
Between acting roles he works as a freelance corporate trainer.