This document discusses challenges with quantifying the value of different marketing channels across the customer journey. It addresses three main challenges: 1) siloed marketing measurement based on the last click, 2) managing marketing spend across many touchpoints, and 3) planning, executing, and tracking marketing investment impact. The document proposes advanced attribution modeling and scenario planning solutions to value each marketing touchpoint's contribution over time. It claims the approach helped one company increase key metrics like revenue per order by 66% and return on ad spend by 20%.