Sample WORLD model has stocks modified by variables, without flows

[kittyabnjr]

Why does the sample world model have some stocks which are only connected with auxiliary variables, and no flows?

[Administrator]

Which model is this please? What is the filename?

[tomfid]

If you're talking about World3, it does. This is basically a stylistic difference that shows its origin in DYNAMO. Those variables aren't levels, but they contain macro functions (SMOOTH) that have an internal state. So, they are drawn with a box to make that state visible.

You could replace those with an explicit stock-flow adjustment structure that would be a little more conventional in terms of SD graphical representation. I don't think it would help clarity though.