Why the starting point of the technology shock to output is negative

Dear all,
the other aspects of my model seems all right. Why the starting point of technology shock to output is negative? Where is the problem?

technology%20shock%20to%20out

Without knowing the model, it is impossible to tell what is going on.

Dear Professor,
I meet the same problem with aibenaimer1. Could you please tell me why the starting point of technology shock to output is negative?
Here is my model:
calib6a.m (2.4 KB)
model6f.mod (5.7 KB)
Hope for your reply.

With a model that size it is impossible to tell. I can only give you the generic advice:

Thank you very much. I’ll try to simplify the model.