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Figure 1-7. A simple stock-and-flow.
The simplest use only stocks ( elements ) and flows ( in and out ), while complex models integrate
the feedback loops, limits, and delays that produce growth, self-organization, hierarchy, oscilla-
tion, dynamic equilibrium, resilience, and collapse. This simple language can describe the most
complex phenomena.
Figure 1-8. A more complex stock and flow.
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