Plain language, shorter sentences, no jargon.
Stocks and Flows: The Accumulation Structure of Systems
Understanding what accumulates and what drains it is the skeleton of every system.
Your bank account, body weight, national debt, and trust in a relationship all share one structure: something accumulates over time, shaped by what flows in and what flows out.
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A stock is any quantity that accumulates or depletes over time: water in a bathtub, trees in a forest, knowledge in a mind. A flow is the rate of change: the faucet filling it, the drain emptying it.
Stocks give systems inertia. You cannot instantly empty a reservoir or rebuild trust overnight: stocks change only as fast as their flows allow.
Seeing the world in stocks and flows transforms vague goals into measurable dynamics, making personal growth and collective change far more tractable.
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