# Question for loss function

**URL:** <https://discourse.macromodelbase.com/t/question-for-loss-function/169>\
**Category:** Uncategorized\
**Created:** [January 9, 2022, 2:49pm UTC](https://discourse.macromodelbase.com/t/question-for-loss-function/169 "2022-01-09T14:49:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ismail](https://avatars.discourse-cdn.com/v4/letter/i/779978/32.png) [@ismail](https://discourse.macromodelbase.com/u/ismail)\
**Post date:** [January 9, 2022, 2:49pm UTC](https://discourse.macromodelbase.com/t/question-for-loss-function/169/1 "2022-01-09T14:49:36Z")

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Greetings to all  
I am a beginner student I am working on coordination between fiscal and monetary policy, and I want to find the optimal combination of the two policies that achieve the lowest loss to the economy.  
Any directions or help?  
My greetings

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**Author:** ![kaiL](https://avatars.discourse-cdn.com/v4/letter/k/cdc98d/32.png) [@kaiL](https://discourse.macromodelbase.com/u/kaiL)\
**Post date:** [June 27, 2022, 9:34am UTC](https://discourse.macromodelbase.com/t/question-for-loss-function/169/2 "2022-06-27T09:34:11Z")

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Hi, I think you cannot do it directly in the mmb. you’ll need to define a loss function and a model. Maybe you could consult Grohé Uribe 2005 on optimal fiscal and monetary policy as a start.