Chapter 2 Flashcards — A Brief Visit to the Systems Zoo
flashcards tis systems-thinking archetypes delays
Why do systems with similar feedback structures produce similar behaviors even when they look completely different outwardly?
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Because behavior is determined by feedback structure, not by the physical nature of the elements. A population (births/deaths) and a capital stock (investment/depreciation) have identical reinforcing + balancing loop structures → identical behavioral repertoires.
What is the key insight from the thermostat archetype about feedback loops and time?
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The information delivered by a feedback loop can only affect future behavior; it can’t correct behavior that drove the current feedback. There is always a response delay — meaning a stock-maintaining system must overshoot its goal slightly to compensate for ongoing drains.
What is the “breakdown point” of a balancing feedback loop?
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Every balancing loop has a threshold where competing loops become stronger and the system fails to reach its goal. Example: a heating loop can’t maintain room temperature on a very frigid day if insulation is too poor — the cooling loop wins.
In the population/economy archetype (R + B loops), what determines the system’s current behavior?
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Whichever loop dominates. R dominant → exponential growth. B dominant → exponential decline. Equal strength → dynamic equilibrium. Shifting strengths → S-curves or oscillations.
What are the three delays in the business inventory archetype?
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- Perception delay: averaging sales over several days before reacting. 2. Response delay: making up shortfalls gradually rather than all at once. 3. Delivery delay: time from placing an order to receiving goods.
Why does reacting faster (shorter perception delay) worsen inventory oscillations?
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Counterintuitively, reacting faster amplifies overshooting. The fix is to react more slowly (longer response delay), which gives the system time to settle before making another correction.
What causes business cycles, according to systems thinking?
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Business cycles are produced by the structure of inventory/production/delivery systems: balancing loops + multiple delays + reinforcing loops through employment and speculation. They are not caused by presidents or external events.
What is the “doubling trap” for nonrenewable resources?
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Under exponential growth of extraction, a resource that seems to have a 200-year supply at constant use might last only 40 years at 5% annual growth. Doubling the resource gives only one additional doubling time (~14 years in that case), not double the lifetime.
What is the counterintuitive effect of higher prices on a nonrenewable resource economy?
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Higher prices → more capital investment → faster depletion (not slower). Higher prices accelerate the collapse, not slow it, because they incentivize extracting more.
What are the three possible outcomes in the fishing (renewable resource) archetype?
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Depending on how fast balancing feedback kicks in relative to critical thresholds: 1. Overshoot → equilibrium: fleet levels off sustainably. 2. Overshoot → oscillation: slight technology improvement delays feedback → instability. 3. Overshoot → collapse: technology so efficient it’s profitable even at very low fish density → fish collapse.
Why does improving fishing technology make collapse more likely?
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Better technology (e.g., sonar) means the fleet can profitably harvest fish even at very low fish density. The balancing feedback loop (low fish → low profit → less investment) is too weak to stop extraction before fish drop below the critical regeneration threshold. High leverage, wrong direction.
What is the difference between a nonrenewable and a renewable resource in terms of limits?
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- Nonrenewable (stock-limited): entire stock available at once but cannot be renewed. Faster extraction = shorter lifetime. - Renewable (flow-limited): can support harvest indefinitely only at ≤ regeneration rate. If extracted beyond that rate too long, may effectively become nonrenewable.
What principle governs all growing systems in constrained environments?
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Any growing entity must have at least one reinforcing growth loop and must eventually encounter at least one balancing constraining loop. No system can grow forever. The timing and strength of the constraint determines whether behavior is: smooth leveling, oscillation, or collapse.
What does the general quote “a quantity growing exponentially toward a limit reaches that limit in a surprisingly short time” mean in practice?
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Exponential growth deceives us because it appears gradual until very close to the limit, then accelerates dramatically. A 200-year supply at constant use might last only 40 years under 5% annual growth. This is the core of many environmental and resource depletion surprises.
Total Cards: 14
Review Time: ~7 minutes
Priority: HIGH
Last Updated: 2026-05-30