# Unit root in stationary model

**URL:** <https://forum.dynare.org/t/unit-root-in-stationary-model/2825>\
**Category:** Dynare help (legacy posts)\
**Created:** [12 November 2012 13:28 UTC](https://forum.dynare.org/t/unit-root-in-stationary-model/2825 "2012-11-12T13:28:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ilobayesian](https://forum.dynare.org/letter_avatar_proxy/v4/letter/i/ba8739/32.png) [@ilobayesian](https://forum.dynare.org/u/ilobayesian)\
**Post date:** [12 November 2012 13:28 UTC](https://forum.dynare.org/t/unit-root-in-stationary-model/2825/1 "2012-11-12T13:28:16Z")

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Dear All,  
I am coding the flexible prices version of Gertler, Sala and trigari (2008). The model is detrended and log-linearized around the steady state, but I still get an eigenvalue equal to one and so there is a unit-root. The strange thing is that this does not happen in the model with frictions. One thing I have noticed is that the variance of the real prices is really small, but I do not know if that matters.  
Could someone help?

Many thanks  
[mod and ss files.zip](https://forum.dynare.org/uploads/default/original/2X/4/4539a32eb1f6817f9dcaf40fd52e7d47278275c8.zip) (3.02 KB)