# Longlasting IRFs **URL:** https://forum.dynare.org/t/longlasting-irfs/13781 **Category:** Stochastic simulations **Created:** [9 May 2019 10:14 UTC](https://forum.dynare.org/t/longlasting-irfs/13781 "2019-05-09T10:14:52Z") **Posts on this page:** 1 **Showing post:** 2
### Author: ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer) #### Post date: [9 May 2019 10:58 UTC](https://forum.dynare.org/t/longlasting-irfs/13781/2 "2019-05-09T10:58:39Z")
That is hard to tell. Most of the times, we actually want out model to feature persistence, i.e. endogenous propagation. In a quarterly model, 50 periods is a bit more then 10 years. That can still be considered a business cycle frequency. --- _[View the full topic](https://forum.dynare.org/t/longlasting-irfs/13781)._