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Negative Steady State in GK13

PostPosted: Tue Jul 18, 2017 9:56 am
by Keynesian94
Hi,
I've been adapting Gertler&Karadi 2013 (QE 1 vs 2 vs 3), but discovered that the steady state values of the model I got from the macro modelbase are negative, i.e. Yss, Lss, Kss, Css etc are all negative.
The model runs, and my adaptions also generate the expected results.
Still, to calibrate a new parameter, I wanted to look at the impact on steady state net worth over GDP (so Yss). This yields strange results of course, as Yss is negative.
Does anyone have a clue?
Thanks!

Re: Negative Steady State in GK13

PostPosted: Tue Jul 18, 2017 10:04 am
by jpfeifer
If you look closely, you will see that these are not the steady state of the levels, but of the log-levels. The logarithm of a positive number smaller than 1 are negative.

Re: Negative Steady State in GK13

PostPosted: Tue Jul 18, 2017 11:23 am
by Keynesian94
jpfeifer wrote:If you look closely, you will see that these are not the steady state of the levels, but of the log-levels. The logarithm of a positive number smaller than 1 are negative.

Dear jpfeifer,
I had overlooked that indeed!
Thanks for your help, that'll fix the issue for me.