# Blanchard Kahn conditions are not satisfied: indeterminacy due to rank failure - for semi structural model

**URL:** <https://forum.dynare.org/t/blanchard-kahn-conditions-are-not-satisfied-indeterminacy-due-to-rank-failure-for-semi-structural-model/21786>\
**Category:** Semistructural Modeling\
**Created:** [14 January 2023 16:35 UTC](https://forum.dynare.org/t/blanchard-kahn-conditions-are-not-satisfied-indeterminacy-due-to-rank-failure-for-semi-structural-model/21786 "2023-01-14T16:35:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mikheil](https://forum.dynare.org/letter_avatar_proxy/v4/letter/m/278dde/32.png) [@Mikheil](https://forum.dynare.org/u/Mikheil)\
**Post date:** [14 January 2023 16:35 UTC](https://forum.dynare.org/t/blanchard-kahn-conditions-are-not-satisfied-indeterminacy-due-to-rank-failure-for-semi-structural-model/21786/1 "2023-01-14T16:35:34Z")

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Hello,

I am running into the following error while trying to get IRF from semi-structural new-Keynesian model. Everything seems fine into the equations, it says that

There are 5 eigenvalue(s) larger than 1 in modulus  
for 5 forward-looking variable(s),  
but  
The rank condition ISN’T verified!  
and the error:  
Blanchard Kahn conditions are not satisfied: indeterminacy due to rank failure

I am attaching the model code to this post. Can someone tell me what may be the problem,

Thanks.

[Gap\_model.mod](https://forum.dynare.org/uploads/short-url/eHbT68FdAFnFVQC0Ix75AYdlPN9.mod) (2.3 KB)

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**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\
**Post date:** [15 January 2023 18:06 UTC](https://forum.dynare.org/t/blanchard-kahn-conditions-are-not-satisfied-indeterminacy-due-to-rank-failure-for-semi-structural-model/21786/2 "2023-01-15T18:06:08Z")

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That typically indicates a fundamental singularity like including a redundant equation while at the same time missing an important one. Unfortunately, it’s not easy to debug. Usually it involves simplifying the model to see what causes it.

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<div class="post-metadata">

**Author:** ![Mikheil](https://forum.dynare.org/letter_avatar_proxy/v4/letter/m/278dde/32.png) [@Mikheil](https://forum.dynare.org/u/Mikheil)\
**Post date:** [15 January 2023 20:17 UTC](https://forum.dynare.org/t/blanchard-kahn-conditions-are-not-satisfied-indeterminacy-due-to-rank-failure-for-semi-structural-model/21786/3 "2023-01-15T20:17:00Z")

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Thank you very much. I will try to simplify and find what equation causes it.