Changed one variable, can't find steady state anymore

Helpful people of Dynare,

I had a .mod file that worked, but the steady state of my exogenous variable, z, was 0, which will not work with log-linearization. z was always used in the context of exp(z), so I though this would be a simple fix. In a new .mod file, I changed all instances of exp(z) to A, so the steady state of A is 1. However, the new .mod can no longer find the steady state:

Error using print_info (line 32)
Impossible to find the steady state (the sum of square residuals of the static equations is 6.5834). Either the model
doesn’t have a steady state, there are an infinity of steady states, or the guess values are too far from the solution

What is happening? Both .mod files are attached.

Thank you,

andolfatto_v6.mod (2.8 KB) andolfatto_v7.mod (2.9 KB)


A = (1-rho_) * 1 + rho_ * A(-1) + vareps; 

instead of

A = rho_ * A(-1) + vareps; 

The latter has steady state 0

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