What a Marketing Mix Model Is and Whether Your Team Needs One

Marketing teams facing budget questions often find that last-touch reports and self-reported surveys cannot show which spending actually works. A marketing mix model answers this by using weekly spend per channel and outcomes such as sign-ups, splitting results into a baseline and the portion driven by media. The method works from aggregated totals rather than individual users, so it needs no personal data and can weigh offline channels alongside online ones. It is typically built on around three years of weekly history, and open-source tools from Google and PyMC Labs have lowered the software cost. The article argues that AI-assistant influence, which has no spend line, will need separate measurement.