Reference #336: Thinking in Systems
In a finite environment, no physical system can grow forever. All physical, growing systems will eventually face constraints in the form of a balancing loop. These systems will always have at least one reinforcing loop driving growth and at least one balancing loop constraining growth. The balancing loop eventually displaces the dominance of the reinforcing loop by strengthening outflows or weakening inflows.
Meadows. Thinking in Systems, 2008. (58-59)