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A Stock is an Amount at a Moment and a Flow is a Rate over Time

Owns the reserved 'stock vs flow, units' claim for stk-. Tier 0: rests only on the entry floor (reading a quantity over time, telling how much from how fast). Every other stk- node rests on it, and the lop- polarity nodes and the lev- buffer lever reach back to it. Stops at the fence: no differential equations and no integral notation, because the unit test does all the work here.

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Stock and Flow Diagrams in System Dynamics

In system dynamics, a stock and flow diagram formalizes a causal loop diagram by distinguishing stocks (accumulations that change gradually over time, such as a quantity that cannot be computed insta…