Action & Reaction
Updated 2026-08-11
INTRODUCTION
English translation pending.
CORE DEFINITION
Newton's third law states that for every action there is an equal and opposite reaction, published in 1687 in the Principia. Applied to policy and management, it means any intervention pushes on a system that pushes back: people adjust, evade, or substitute, and costs shift to other parties. The observed result is therefore the intended effect minus the reaction. Reactions are often delayed and land in places nobody measures, so a policy that looks successful in the first period may quietly fail in the second.
SCAFFOLDING EFFECT
Reduce cognitive load
- Reaction mapping: list the counter-behaviors an intervention is likely to trigger - Delay check: ask when the reaction will show up and where it gets recorded - Force redesign: change the system instead of pushing harder against the reaction
Anchor fast decisions
An intervention applies pressure to a system of agents who each optimize for themselves, so the pressure creates an incentive to move away from it. The response takes the form of evasion, substitution, or cost shifting onto a third party. Because these adjustments take time and often appear outside the measured variable, the reaction stays hidden in short-term data. Suppressing rather than absorbing it raises the internal pressure and shifts it into a less visible channel, where it eventually releases with greater force.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- mungermodels.comhttps://mungermodels.com/models/action-reactionverified
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