Mobile Phone Subscribers
Principles of accumulation and depletion of resources.
Accumulation and depletion (building and losing) of a customer base (or other resource) over time. Reinforcing feedback drives growth from word of mouth and balancing feedback limits growth, due to capacity limits,
Graduated exercise help demonstrate the difficulty of managing a single-stock system - which when compounded creates dynamic complexity
Customers accumulate in virtually every business context; word-of-mouth drives customer growth in many industries, customer growth is limited by the business's capacity to support sales or service in many cases.
Contexts where similar specific structures arise - exploiting a potential new market for any capacity-limited service (internet services, travel, leisure, business services etc.).