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Thea Locke's avatar

Really enjoyed this one. Curious how you think about the tension between the 48-hour rule and acting quickly on genuine opportunities during sharp sell-offs. For example, in March 2020, the window to buy quality compounders at 30-40% discounts was roughly 10 trading days. Do you apply a different framework when the entire market is on sale vs. when a single stock declines?

김영민 (Young Min Kim)'s avatar

This is a fantastic breakdown of the 'human software' bugs that plague investors. In engineering, we rely on redundancy and fail-safes to prevent catastrophe; an investment journal is essentially a fail-safe for the mind. I particularly appreciate the distinction between Owners and Speculators. From a physics perspective, speculators are focused on the 'velocity' (price movement), while owners are focused on the 'mass' (the underlying business value). If the mass is growing at 20% a year, the short-term velocity is just noise. Excellent roadmap for staying rational.

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