Uploaded on 2017-06-02

Disclaimer: The picture above has no relevance to the answer and was uploaded because the window did not let me submit the story without an attached image. I do not own the above picture. Stocks: 1. arable land - could change if farmland is expanded beyond it's present borders 2. health services - could change if a new hospital were built 3. books in the library of the local University - could change if books are exported or imported in large quantities Flows 1. students - a dynamic presence on the university campus 2. bicycles - as one of the primary modes of transport, bicycles move in and out of my area in large droves everyday 3. rainwater - it's always raining in the netherlands