Living in Downside Cases - How Does That Impact Your Modeling?

The idea that revenues can go from growing to declining, if you've never seen that happen, it just seems like a bookish exercise. So i think literally, living in downside cases makes it easier to imagine model plan for downside cases. There's something about the human brain that is more easy to understand ovesy than likea demic experience that you read about or some one else is telling you about. I think, until you've lived it's just a theory and an excelse bred sheet in your modelling.