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  • Have you worked it out? Use the money you put in at the beginning, not the current value

    Why? The sunk cost is not really relevant - the value is where you could trade out to another asset today if you wanted to.

  • The sunk cost is not really relevant - the value is where you could trade out to another asset today if you wanted to.

    Yeah, it's kinda weird. I can see arguments for using value or purchase costs depending on what you are trying to do. In this case sunk costs would provide the slightly less depressing answer.

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