Line 44-46 of my mod file define the shock u,which should occur at period 10 and its value equals gw。Line 16 shows at period 10 , z should be zero (e is a shock happening just at period 1)。dynare could run this mod file and give outputs ,but z doesn’t become zero from period 10,it seems shock u doesn’t occur.

any help would be appreciated , thanks.

omomiu.mod (585 Bytes)

# Shock using expression doesn't occur

**mrain**#1

**mrain**#3

shock u happens at period 10,as my file defines,doesn’t it mean u equal the value of gw at period 10 ?(at peroid 10 gw not equal 0)

**jpfeifer**#4

This is a perfect foresight simulation. You need to specify the shocks in advance. So when you use the value of `gw`

that is the steady state value of 0, not the endogenous value that `gw`

might take on later.