= System dynamicist
A <system dynamicist> studies feedback and <time evolution> using <system dynamics> models. Stocks describe accumulated quantities and flows describe their rates of change, while feedback links the rates to the current system state.
For a simple stock $N$ with inflow $a$ and proportional outflow $bN$, the model is $\dot N=a-bN$. Its <equilibrium> and adjustment timescale follow from the equation. A useful model also states the evidence and assumptions behind the chosen feedback relationships.
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