Shifting Dominance, Delays, and Oscillations
Complex behaviors in systems arise as the relative strengths of feedback loops shift, with delays in balancing feedback loops causing oscillations. Changing the length of a delay can significantly alter system behavior.
THE IDEA
Shifting Dominance, Delays, and Oscillations
- Complex behaviors of systems often arise as the relative strengths of feedback loops shift, causing first one loop and then another to dominate behavior.
- A delay in a balancing feedback loop makes a system likely to oscillate.
- Changing the length of a delay may make a large change in the behavior of a system.
When to use it
Forecasting and inventory management in supply chains to avoid boom-and-bust cycles.
Designing policies for economic stimulus that account for delays in implementation and response.
Managing ecological systems where shifting feedback loops (e.g., predator-prey dynamics) affect long-term stability.
Programming feedback controls in engineering, such as thermostat systems with time lags that cause temperature oscillations.
FROM THEORY TO EVERYDAY LIFE
In practice
Business Inventory Oscillations
A company orders inventory based on current sales, but there is a delay between order placement and receipt. If the delay is long, the balancing feedback loop (ordering to meet demand) can overshoot, leading to cycles of excess inventory and shortages.
Climate System Regime Shifts
In climate systems, different feedback loops (e.g., ice-albedo effect, greenhouse gas warming) can dominate at different times. A delay in the response of ice melt to temperature increases can cause oscillations in global temperature patterns.
A MOMENT TO REFLECT
Put it to work.
Think of a system you interact with daily. What delays exist in its feedback loops, and how might they cause oscillations?
Can you identify a situation where a shift in dominance between feedback loops led to a surprising change in behavior?
How could you deliberately shorten or lengthen a delay to improve the stability of a system you are part of?
CONTINUE THE CONVERSATION
Source texts
- Thinking in Systems A Primer