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Ramsey optimal policy SOE model: BK no stable equilibrium

PostPosted: Mon Oct 12, 2015 9:24 am
by Philipp
Dear Forum,
I have a small open economy model which works fine when the monetary policy rule is specified. I have solved analytically for the steady state and everything should be ok (See the working model attached).
Now I would like to derive the Ramsey optimal policy, however I run into the following error:
Blanchard Kahn conditions are not satisfied: no stable equilibrium

My guess is that this has to do with the initial conditions I give to the model, however I am a bit lost on how to proceed. Any help or comment is greatly appreciated.
Best,
Philipp

Re: Ramsey optimal policy SOE model: BK no stable equilibriu

PostPosted: Sat Oct 17, 2015 7:54 am
by jpfeifer
I think you need to understand the economics here. You seem to combine a money growth rate with independent interest setting. Are you sure that this is not inconsistent so that no equilibrium exists?