Why is the stolen $40,000 in Psycho considered a MacGuffin?

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The stolen money is initially presented as a major plot point, driving Marion's decision to run away and ultimately leading her to the Bates Motel. However, once she is killed and the focus shifts to Norman and the investigation into her disappearance, the money becomes largely irrelevant in terms of the plot. It serves as a motivation for Marion's actions, but ultimately has little impact on the overall story. This is a classic example of a MacGuffin - something that drives the plot but is ultimately of little importance to the story itself.

Why Is the Stolen $40,000 in Psycho Considered a MacGuffin