Marketing Mix Modeling limitations include a reliance on historical data, the inability to capture short-term effects, and the challenge of accounting for external factors that may influence sales independently of advertising programs.
As good as MMMs have become, they are not a complete solution for a marketer with a very large media budget with many addressable and non-addressable channels in play. Experimentation (Incrementality Testing) should be considered as a means to test and learn, while the MMM provides the foundation for the measurement and optimization practice.
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