[amalcon]

Those particular statements referred to some representative economic model, not the experiment in question. In the experiment in question, the model is fully specified by definition.

As far as overfitting goes, that applies when you have a parameterized general model and need to discover the correct parameters. You probably won't get the exact correct parameters; instead, you'll (hopefully) get parameters that approximate reality well.

More closely matching the training data can actually make it a worse approximation in the general case.