This document discusses how to quantify marketing effectiveness and efficiency using funnel metrics based on the buyer's journey. It describes how funnel metrics map to the awareness, engagement, and outcome stages of the buyer's journey. There are two main types of funnel metrics: effectiveness metrics like impression volume, engagement rates, and outcome volume, and efficiency metrics like cost per impression, engagement, and outcome. The document provides examples and calculations for key funnel metrics to measure marketing performance at each stage of the buyer's funnel.