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Created by MichelJuillard@MichelJuillardDeveloper

checking singularity in first order approximation

Currently, we don't check for singularity in first order approximation when solving for static variables (is b10 singular?) or solving for shocks coefficient (is A_ singular?)

  1. We should probably add a warning to stoch_simul (and ramsey_policy)
  2. Should we care for estimation? Should expand the implicit prior to b10 and A_ non-singular?
  3. If b10 is singular, the model has a problem: it is not possible to determine some static variable from the solution of the dynamic part of the model
  4. The conditions under which A_ can be singular are mode difficult to determine.