Are some actors worth more than others?

Such as one actor demands more money for a role, they get rejected by producer or director but then end up paying another actor more than the other actor wanted Why would that happen? For instance Steve McQueen was offered the lead role of Willard in Apocalypse Now (1979), this was in 1976 and he refused but... show more Such as one actor demands more money for a role, they get rejected by producer or director but then end up paying another actor more than the other actor wanted

Why would that happen?

For instance Steve McQueen was offered the lead role of Willard in Apocalypse Now (1979), this was in 1976 and he refused but wanted the role of Colonel Kurtz and demanded a large sum of money but Coppola turned him down.

Yet eventually they cast an actor as Kurtz who was not as famous as McQueen but paid him more than McQueen wanted.

Ate some actors worth more than others? What makes an actor command huge salaries?
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