Can anyone confidently answer this ONE question about advertising?

Maybe.

But probably not.

Though I do know some AI-powered MMM's that are real damn close.

Prescient.ai helped a B2B medical supply company predict their sales outcome from advertising to within 2% accuracy - 84 days in advance. That's almost an entire quarter.

Get into the conversation about how AI is shaping advertising here:
https://www.theoohinsider.com/daypart-ai/