Estimate loss fonction

gentlemen researchers
I want to estimate the loss function to find the optimal combination of fiscal and monetary policy
Any help or directions?

The question is too broad and generic. What do you mean with


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I mean, I have a loss function and I want to estimate it, how is that?

If you already have a derived loss function, you can simply optimize the loss with respect to the parameters in the function. There are numerous examples in the forum.

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Thank you professor
Can you give me a practical example please?

See e.g. Optimal policy parameters in a non-linear model