Requesting help to develop a SD model

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Chamari
Junior Member
Posts: 3
Joined: Sat Feb 22, 2020 2:24 am
Vensim version: PLE

Requesting help to develop a SD model

Post by Chamari »

Hi,

I need to draw a Stock-flow diagram to see the effect of used materials on different types of cost. I compare the used material cost with the new material cost. I assume the demand for aggregates increases yearly, but supply for aggregates reduces over the time regularly after a certain period (for example after 100 years). When new material supply reduces longer distance suppliers must be reached which results higher transportation cost.

But I do not have an idea of how to draw this exact idea in Vensim and define functions. Pls see the attached. Could u please advise me how I can improve this further to achieve my objective. Thank you.
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Revised final 10.mdl
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