The sunk cost fallacy assumes that because something warranted a significant financial investment in the past, it is too valuable to do away with no matter the evidence.

Similarly, what I call the sunk virtue fallacy assumes that because a significant investment of effort in the past was effective, it is too valuable to do away with, no matter the evidence. Clinging to sunk virtue can be like clinging to a half-wrecked boat. You are lucky to keep your head above water.

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