Chapter 4 Flashcards — Why Systems Surprise Us
flashcards tis systems-thinking nonlinearity bounded-rationality delays
What are the three levels of understanding a system, from shallowest to deepest?
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- Event level: “X happened because of Y.” No predictive power. 2. Behavior level: Trends over time, patterns, historical context. 3. Structure level: Interlocking stocks, flows, and feedback loops — reveals levers for change.
Why do econometric models predict short-term reasonably but fail long-term?
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They find statistical links between flows — but flows only correlate because they’re governed by the same stocks. Change the underlying feedback structure, and correlations break. Behavior-based models can’t predict what happens when the structure changes.
What is nonlinearity and why does it matter?
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Nonlinearity means cause does not produce proportional effect — the act of playing the game changes the rules. It matters because: 1. It confounds “if a little helps, a lot helps more.” 2. It changes relative strengths of feedback loops — the chief cause of shifting dominance. 3. It can flip a system from one behavioral mode to another entirely.
What happened with the spruce budworm and pesticide spraying?
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Spraying to suppress periodic outbreaks also killed natural predators. Result: persistent near-outbreak conditions at unprecedented scale. All relationships were nonlinear (reproduction vs. food supply; predator response vs. budworm density). Spraying created a volcanic state: always simmering, one condition away from eruption.
What is the “boundary problem” in systems thinking?
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All system boundaries are artificial — the world is a continuum with no separate systems. Too narrow a boundary causes surprise from excluded effects (highways attract development → more traffic → same congestion). Too wide a boundary creates overcomplication. The right boundary depends on the purpose of the discussion and time horizon.
What is Liebig’s Law of the Minimum?
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The most important input to a system is the one that is most limiting at any given moment. It doesn’t matter how much nitrogen you have if phosphorus is the shortage. Bread won’t rise without yeast, no matter how much flour. Capital transfers to poor countries don’t develop economies if capital isn’t the limiting factor.
How do layers of limits change as a system grows?
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Growth depletes or enhances limits, shifting which factor becomes next-most-limiting. A company’s limiting factor shifts from production capacity → labor skill → management bandwidth as it scales. No physical system can grow forever — limits will be encountered.
What does “delays are ubiquitous” mean for system behavior?
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Delays appear everywhere and are systematically underestimated. A feedback loop with a long delay will overshoot its goal, causing oscillations. Examples: disease incubation periods, pollution emission to harm (decades), commodity cycles (4-year pig cycles, 7-year cattle cycles), capital stock turnover (10-15+ years).
What is Jay Forrester’s rule of thumb about delays?
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Whatever delay people estimate, multiply it by three. Systems consistently take longer to respond than human intuition predicts.
What is bounded rationality?
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People make quite reasonable decisions based on the information they have — but they don’t have perfect information, especially about distant parts of the system. We are “blundering satisficers,” not omniscient optimizers.
What are the key ways humans fail to interpret information correctly even when they have it?
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- We misperceive risk. - We pay too much attention to recent events, too little to long-term history. - We discount the future at economically/ecologically irrational rates. - We don’t admit information that doesn’t fit our mental models.
What is “the great insight” of bounded rationality?
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If you were placed in someone else’s position in the system, you would behave as they do. As a fisherman with a mortgage and imperfect information about fish stocks, you’d overfish. Blaming individuals rarely helps — putting a new person in the same system produces the same behavior.
How does the Dutch electric meter example illustrate the way out of bounded rationality?
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Houses built identically except for meter placement (basement vs. front hall) used 30% less electricity with front-hall meters. No laws changed, no prices changed — just information visibility. Even slight enlargement of bounded rationality can produce large behavioral changes. The fix is to redesign the system’s information flows, not replace the individual actors.
Total Cards: 13
Review Time: ~7 minutes
Priority: HIGH
Last Updated: 2026-05-30