We can predict GDP. Everyone knows ballpark where it will be without calamity. The GDP is an overal measure of something not based on 'events'. What we cannot

We can predict GDP. Everyone knows ballpark where it will be without calamity. The GDP is an overal measure of something not based on 'events'. What we cannot predict are 'events' - like COVID, or a rash of market information coming to light like 2008 causing a domino effect. Predicting marketing spend is like predicting what colour someone will chose for their favorite colour: it's within some range, but it's a choice.