Cognitive Scaffold

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MENTAL MODEL · M1018

Catching a Falling Knife

Catching a Falling Knife
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

Buying an asset during a sharp price decline in an attempt to catch the bottom of a rebound. Often results in getting hurt, because momentum is often stronger than fundamentals.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Counterintuitive operation. When things are deteriorating, don't rush to 'bottom fish' or 'put out fires'. Wait for the knife to fall and become still (stability) before picking it up, even if the cost is slightly higher, it's better than getting hurt.

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Anchor fast decisions

Falling assets are often driven by momentum (trend), and price inertia causes the 'bottom' to keep moving down; fundamental repair lags behind price, so bottom fishing often catches the knife mid-fall. Before the knife lands (trend stabilizes), the downside risk is much greater than the rebound gain.

MINIMUM ACTION

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Source support: Explicit

  • link
    investopedia.comhttps://www.investopedia.com/what-buying-the-dip-really-means-and-when-it-becomes-a-falling-knife-11770835ZH · Explicit
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