On John Huston's The Treasure of the Sierra Madre (1948) and what it does with greed that most films about greed don't.

The Treasure of the Sierra Madre is a film about three men searching for gold in Mexico and what the search does to them. The film's moral is the most ancient one in Western storytelling: greed corrupts. But Huston delivers this moral with a psychological precision that the cliché obscures.

Fred Dobbs, played by Humphrey Bogart in one of the most self-aware performances of his career, is not a villain who becomes greedy. He is a man whose genuine fear of returning to poverty transforms, incrementally and believably, into a paranoia that cannot be distinguished from madness.

What makes the transformation so effective is that Huston shows the greed as a cognitive structure: Dobbs begins constructing interpretations of his partners' behavior that are internally consistent but disconnected from reality. The film is not a morality tale about the evils of greed. It's a psychological study of how fear of loss becomes indistinguishable from actual threat.

The final scene is one of the most genuinely earned dark jokes in American cinema, and B. Traven's source novel has been described as one of the first American works to fully understand this irony.