Investment Delays

Dynare help (legacy posts)
1

I am trying to program the investment delay described in Bernanke Gertler Gilchrist what '99 into their financial accelerator model (or one like it anyway). In the paper, they claim that it is sufficient to change q=psi*(i-k(-1)) to
E_t[q(+1)-psi*(i(+1)-k)]=0. Of course when i try that in Dynare, the rank condition is no longer satisfied. I tried stepping them forward and then using a past expectation too:

dummy=q(+1)-psi*(i(+1)-k)
dummy(-1) = 0

In this case, Dynare tells me that I have 8 forward looking variables and 8 eigenvalues grater than one in absolute value but that the rank condition is NOT satisfied.

Anybody have any idea what is going on and how to get past it? Thanks!

Cheers
Rob

the simplified code for bgg is attached.
bggwork.mod (1.7 KB)

2

hi,

have u looked at the hall 2001… financial accelerator in the UK

what he basically does is to say

i = in(-1)

and then he includes “in” into equation.

hope this helps

michael

3

Thank you, that seems to do the trick.

4

This works perfectly,but I’m not sure is it reasonable,why we not do the trick on q? Actually I do the trick on q instead, the figure looks weird.