more flexible mechanism for having different equations between the static and the dynamic model
Currently, if one wants to tell Dynare that an equation has a different form between the static and the dynamic model (for example when the modeler wants to use his knowledge about the steady state to simplify the steady state computation), then the possibilities are:
- write a steady state file (heavy)
- write a
steady_state_modelblock (one has to rewrite all the equations in that block)
- use a dirty hack with the macroprocessor and run Dynare two times
steady_state_model is good for small models. But for big models where you want to change only a few equations, only the third option of this list is reasonable, and it is dirty.
The proposal is to introduce two equation tags which will have a special meaning to the preprocessor:
[static]: this equation belongs to the static model, but not to the dynamic model
[dynamic]: the opposite
This would offer a very flexible way to change only a few equations during the steady state computations.
This is a request by @FerhatMihoubi for GPM and possibly GIMF.