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two shock in two time in a loop
Posted: Fri Feb 14, 2020 8:19 pm
by atabesh
hello my friends
I work in a recursive dynamic CGE model.
my set is
t time /1*20 /;
I want to have one shock from t=1 to t=4 (for example increase tax) and I want to have another shock from t=5 to t=20 (for example increase productivity). But I do not know how I can write a loop for this purpose. please help me
Re: two shock in two time in a loop
Posted: Sat Feb 15, 2020 9:58 am
by Renger
Hi
You can loop over the whole horizon and change the parameters for the shocks. Here some example code:
Code: Select all
set t Periods /1*20/;
set sc /BAU, SHOCK/;
parameter parshock(sc,t) Shock some parameters
parshock(sc,t) = 0;
parshock("SHOCK",t)$(t.val < 5) = 2;
parshock("SHOCK",t)$(t.val > 4) = 3;
loop(sc,
loop(t,
myparam = parshcok(sc,t);
solve model...
change capital using investments
);
);
I usually add for each scenario a set like the following:
Code: Select all
set sc /BAU, SHOCK/,
BAU(sc) /BAU/,
SHOCK(sc) /SHOCK/;
Now I can run the loop for a specific scenario without having to run all the other scenarios.
Cheers
Renger
Re: two shock in two time in a loop
Posted: Mon Mar 30, 2020 12:33 pm
by atabesh
Thank you very much
Re: two shock in two time in a loop
Posted: Mon Apr 06, 2020 8:14 pm
by atabesh
I did exactly that, but when I increase the time, for example, from 20 to 30 years, my answer is different.
For example for t /1*20/
I increase the tax rate (t.val<5) then the average GDP decrease 0.5 % from the first year to fifth year
when t is /1*30/
and I increase the tax rate (t.val<5) then the average GDP decrease by 0.8 % from the first year to the fifth year.
I think it is wrong.