Constant or non stationary endogenous variables

[mgeremew]

I am simulating a version of Bernanke, Gertler and Ghilchrist,1999 model on the housing sector. The model runs and generates IRFs but the endogenous variables are constant or non stationary. Any help to fix this would be highly appreciated.

[jpfeifer]

Check the IRFs. If after, say, 1000 periods the IRFs do not return for the variables, they are non-stationary. If this is the case, find out why you have a unit root.