The difference between an inflow or outflow goal and sum of flow is a runaway loop.

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Quizplus · Accepted Answer

An inflow or outflow goal represents a specific target for the amount of flow entering or leaving a system. Sum of flow, on the other hand, simply refers to the total amount of flow entering and leaving a system. There is no inherent connection between these two concepts and there is no reason why they would result in a runaway loop.

The Difference Between an Inflow or Outflow Goal and Sum