I try to run the attached open-economy model that I have build, before that, my model was in closed economy and it worked well. I have introduced the simplest way to move from a closed to an open economy. I just have added the features necessary for imports-exports (no foreign debt). However, when I try to run the model, the BK conditions are not satisfied due to a collinearity problem. As I have added only 6 equations between the closed and the open model I do not see where is the problem because in my view, all the equations are necessary…
I would really appreciate if someone can help me with this.
Thanks for you reply, in fact I changed my fiscal rule by setting zeta=0 and increasing the fiscale brake lambda_b from 0.01 to 0.05, now the model runs, BK are satisfied, but the model diagnostic still tells me that I have collinearity, also when I look at my IRFs some variables do not go back to their steady-state, for instance, after a shock on public expenditures, consumption of home good and consumption or foreign goods do not go back to their steady-states. My model was correct in closed-economy do you think one of my equations from the open economy framework is wrong or redundant which could cause the issue just described ?
Thanks in advance for your answer
But in Schmitt-Grohe, the problem is linked to foreign debt if I’m correct but in my model , I just have exports and imports, no foreign debt, that’s why it looks weird.
Don’t you think it is linked to one of my open economy equations ?
Again, thanks for you reply.
Use irf=2000 to see which variables are affected. That often helps. When you say
are you saying that your model features balanced trade, i.e. imports always equal exports? Because without a net asset position to draw from. how would you finance trade surpluses and deficits?
Yes exactly, I just have a BOP condition stating that X=eM where e is the real exchange rate, imports M are just equal to home consumption of foreign goods (Cf). That’s very simple and I do not see why it may be not correct…
When I look at theoretical moments (mean, variance) , no variable display NaN. However when I look at the IRF , a lot of variables do not go back to their steady-state but in my view it is induced by the lack of convergence of the variables linked to the open-economy framework ( exports, imports, consumption of home good and consumption of foreign goods).