Recording of Brian Hayes presentation on model 3. The date in the description is 12_03_30 . It is a deterministic model made in the late 60s with computers of the time.

The model was used in the book “The limits to growth” (1972)

The model is extremely opinionated as it has to model things like resources or health care as a whole for humanity. Many manually adjusted variables.

It uses its own programming language, dynamo, which was mostly declarative, had a weird sense of time and iteration, and implemented a form of topological sorting.

The speaker didn’t comment too much on the validity of the model itself, but he thinks is remarkable for the time and accomplished on its goal of trying to shape policy.