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Anything in Transit is Itself a Stock, And That Stock is the Delay

The pipeline-delay node from the stk- paragraph; rests on stk-stocks-cannot-change-instantly and reuses the stock-over-flow ratio from stk-buffer-absorbs-shocks. It supplies the concrete material delay that lop- puts inside a balancing loop to produce overshoot and oscillation, and that lev- uses for intervention timing. Stops before any loop: nothing here feeds the output back to the input.

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Modeling First-Order and Higher-Order Delays in System Dynamics

A first-order material delay models outflow as proportional to the current stock (outflow = stock / D), which produces exponential decay of the stock and an outflow whose time-in-system is exponentia…