Comment by StopDisinfo910

It's tautological but models are models.

It doesn't really change anything to their inherent value that you build them from the hypotheses up or from the conclusions down. It holds the same that this set of interactions lead to this behaviour.

Sometimes going down can be equally interesting: "What would a system where tariff improves the overall well being of a country inhabitants look like?". Contrast the model requirements with empirical data and you have an interesting paper.