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Ch. 2 Brief Visit to Systems Zoo (One-Stock Systems (system with delays…
Ch. 2 Brief Visit to Systems Zoo
One-Stock Systems
Thermostat Example
Single Stock, multi-loop
Competing balancing loops (coffee cup)
1 reinforcing (birthrate), 1 balancing (deathrate)
population & economy
shifting dominance
death overtaking birth
system with delays
perception delay - cars inventory
response delay - partial adjustments over time
delivery delay - car delivery from order time
delay in feedback causes oscillations
Two-Stock Systems
Renewable stock constrained by non renewable stock (oil)
the longer the delay, the harder the economic fall
no system can grow forever in a finite loop
Renewable constrained by renewable
price
regeneration rate
critical threshhold
feedback loop speed
yield per unit
Central Insights & Principles
Current feedback ---> future behavior
delays in response time
Systems cause their own behavior
exponential growth towards a finite limit is short