Ever since Neil Borden coined the term “marketing mix” in 1949, companies have searched for ways to analyze and refine how they market and promote their products. For a long time, the leading analytic approach to this problem was “marketing mix modeling,” which uses aggregate sales and marketing data to suggest strategic adjustments to a firm’s marketing efforts. But in the realm of digital ad measurement, this approach was largely taken for an outdated behemoth, easily outmaneuvered by the immediate, precise, and deterministic attribution new technology enabled.