# Impossible to find steady states

**URL:** <https://forum.dynare.org/t/impossible-to-find-steady-states/22610>\
**Category:** Steady state\
**Created:** [16 June 2023 18:27 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610 "2023-06-16T18:27:12Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Bismark](https://forum.dynare.org/letter_avatar_proxy/v4/letter/b/82dd89/32.png) [@Bismark](https://forum.dynare.org/u/Bismark)\
**Post date:** [16 June 2023 18:27 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610/1 "2023-06-16T18:27:12Z")

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Hello professor, I’m getting the error message “impossible to find steady state”.

No matter how i adjust the initvals, the model can’t seem to solve the steady states. What am i doing wrong?

[Tmain.mod](https://forum.dynare.org/uploads/short-url/rXM2mujnLBLviVnSIPE9jmeQb4T.mod) (2.2 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:** [20 June 2023 12:23 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610/2 "2023-06-20T12:23:45Z")

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See

> [@Non-linear vs Log-linearized Model](https://forum.dynare.org/t/non-linear-vs-log-linearized-model/11924/4):
>
> It seems you are missing an exp() around some exogenous processes like A. Otherwise, you will have TFP be mean 0.

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<div class="post-metadata">

**Author:** ![Bismark](https://forum.dynare.org/letter_avatar_proxy/v4/letter/b/82dd89/32.png) [@Bismark](https://forum.dynare.org/u/Bismark)\
**Post date:** [21 June 2023 09:37 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610/3 "2023-06-21T09:37:38Z")

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Many thanks Prof. I’ve read from the page you directed me to but still not really getting it.

Can you please set an example of an equation that contains the exp () A or better still insert one with comment in my mod file to guide me through?

Thank you

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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:** [21 June 2023 13:45 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610/4 "2023-06-21T13:45:49Z")

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For example, you have `A` being mean zero

```auto
A = rho_a*A(-1) + mu_a;

```

That conflicts with

```auto
Y = A*(K^alpha)*(N^vartheta)*(EN^(1-alpha-vartheta));

```

where output would then be 0.

```auto

```

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<div class="post-metadata">

**Author:** ![Bismark](https://forum.dynare.org/letter_avatar_proxy/v4/letter/b/82dd89/32.png) [@Bismark](https://forum.dynare.org/u/Bismark)\
**Post date:** [24 June 2023 22:35 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610/5 "2023-06-24T22:35:27Z")

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Thank you prof but how do you suggest I correct the equation to avoid the zero mean.  
I’m asking because the equation is from literature except I chose to use non linear forms.

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<div class="post-metadata">

**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:** [2 July 2023 23:51 UTC](https://forum.dynare.org/t/impossible-to-find-steady-states/22610/6 "2023-07-02T23:51:28Z")

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Either you use `Y=exp(A)*K^alpha....` or you need the exogenous process as `log(A)=rho*log(A(-1))+epsilon`.