The Physics of Agency, Part 5: The Law of Agency Decay — Entropy Always Wins

Series: Physics of Agency (Part 5 of 10)

Summary

Establishes second thermodynamic law: without continuous energy input, agency capacity inevitably decreases.

Law of Agency Decay: In closed system without external energy, available kybits inevitably decrease over time.

Mechanism: C_available(t) ∝ E_free(t)
As free energy decreases, control capacity decays. Eventually agent stops steering entirely—random drift reclaims dominance.

Implications:

• No perpetual agency
• No infinite choosing without cost
• No escape from thermodynamic consequences

Sustained Agency Requires: Continual intake of negentropy (new ordered energy):

• Food (biological agents)
• Fuel (machines)
• Computation (AI systems)
• Knowledge (informational resources)

Without replenishment, every agent eventually becomes a drifter. Agency is “temporary island in sea of entropy.”

Real-World Examples:

• Starving organisms: survival narrows to reflex
• Depleted batteries: AI systems shut down
• Decision fatigue: exhausted humans lose flexibility

Tags

• physics
• agency
• entropy
• thermodynamics
• chaos
• sequence

Cross-References

• Backward: The Physics of Agency, Part 4: The Law of Control Work — Agency Costs Energy
• Forward: The Physics of Agency, Part 6: The Law of Agency Limits — Perfect Control Is Impossible
• Related: Second Law of Thermodynamics
• Related: Negentropy (Schrödinger)

Notes

• Parallels Second Law of Thermodynamics (entropy increase)
• “Drift always waits” becomes recurring theme
• Anticipates later work on viability ethics (agency preservation)
• Decision fatigue framed as physical phenomenon, not psychological weakness