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12 Systems

feedback loops

by Systems Theory

Core Idea

Outputs become inputs. Positive loops amplify; negative loops stabilize. Understanding feedback structures reveals how systems behave over time.

key principles

  • 01

    Positive feedback amplifies

    More leads to more. Compound interest, viral spread, arms races. Runaway growth or collapse.

  • 02

    Negative feedback stabilizes

    Deviation triggers correction. Thermostats, homeostasis, market corrections. Systems return to equilibrium.

  • 03

    Delays obscure causation

    When cause and effect are separated in time, we often miss the loop. This leads to oscillation and overcorrection.

  • 04

    Multiple loops interact

    Real systems have many feedback loops. Behavior emerges from their interaction, not from any single loop.

applications

Economics
Boom and bust
Positive feedback creates bubbles; negative feedback creates corrections. Delays cause overshooting.
Biology
Homeostasis
Body temperature, blood sugar, hormones—all maintained by negative feedback. Deviation triggers correction.
Social
Network effects
More users make a platform more valuable, attracting more users. Positive feedback until saturation.
Climate
Tipping points
Ice reflects heat (negative feedback) until it melts. Then ocean absorbs heat (positive feedback). Regime change.
Related Models
antifragility
Nassim Nicholas Taleb
second-order thinking
Howard Marks
entropy
Rudolf Clausius

The Loop Structure

Feedback loops are the fundamental structure of dynamic systems. Output feeds back as input, creating circular causation. Understanding these loops is essential for predicting how systems evolve.

Positive loops drive change—for better or worse. Negative loops maintain stability. Most real systems contain both, and their behavior emerges from the interaction.