Stocks are elements that impart inertia and memory to a system, and hence are responsible for internally generating the dynamic behavior of many systems. In GoldSim, Stocks, a second element category called Delays, and a special function element (Convolution) are collectively referred to as dynamic elements.
Mathematically, Stocks are time integrals (i.e., they integrate flows or signals over time). As a result, they have the property that their outputs are determined by the historical (integrated) value of their inputs.
GoldSim provides three Stock elements: Integrators, Reservoirs and Pools.
Pools and Reservoirs are intended to accumulate flows of materials (e.g., cash, water, widgets). Integrators simply integrate signals (e.g., the height of a thrown ball could be computed by integrating the velocity of the ball).
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