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Knowledge Challenge
A friend thinks you can answer this question about Marketing Mix Modeling
Your MMM model shows your TV channel has a saturation curve where $5M of spend drives $25M revenue (5x ROAS), $10M drives $35M revenue (3.5x ROAS), and $15M drives $40M revenue (2.7x ROAS). What's the marginal ROAS of going from $10M to $15M of TV spend?