One of the challenges with investing is when to admit you were wrong. If your goal as a stock picker is to do better than just investing blindly in everything on offer (an index). History is, at least, compelling enough to know that outperforming in 60% of your decisions will raise you to the status of demigod if people give you the credit. But if you underperform more than 50% of the time? If you underperform the benchmark over an extended period? How long is long enough to take the blame? Performance is noisy, which gives lots of space to hide. Going to Zero ends the discussion, but lots of companies stutter along. Max Plank reminds us that Science progresses one funeral at a time. Death is a feature, not a glitch. So how do we know when it is time to let go of beliefs? How do we ensure that we are not so tied to our stories, that we serve them, rather than them serving us? How do you maintain a sell discipline?
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