How to make two shocks happen at the same time

[jpfeifer]

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Two shocks simultaneously in a model

If you are working with a linearized model (order=1), the IRF to a joint shock is the sum of the individual IRFs. That way you can create any linear combination. If you want to do this more formally, you can use the simult_-function to generate any combination you like (even at higher order). See github.com/JohannesPfeifer/DSGE_mod/blob/master/RBC_news_shock_model/RBC_news_shock_model.mod for an example