Stacking audiences by temperature and intent
Audience targeting in paid advertising follows a natural hierarchy, from your hottest prospects at the top to your coldest at the bottom. Customer Match is pure intent - you upload a list of people who have already interacted with you (email, phone, past purchase). Remarketing captures anyone who visited your site or used your app. In-market audiences are people Google has identified as actively researching your category right now. Affinity audiences are broader, built on long-term interest signals. At the base, demographic targeting adds basic age, gender, income filters with minimal purchase intent.
The pyramid inverts the traditional funnel because reach decreases as you climb from cold to hot. Customer Match might reach 5,000 people. Remarketing reaches 50,000. In-market grows to 200,000. Affinity could reach millions. But quality and conversion rates peak at the top and decline as you broaden. Running a high-bid campaign against your customer list and a low-bid campaign against affinity audiences optimizes spend.
Building efficiency by layering warm and cold simultaneously
Most teams underuse the top tiers. If you have 10,000 email addresses of past customers, your Customer Match audience exists right now. Running against that audience costs next to nothing in reach but converts far better than any cold campaign. The constraint is size, not efficiency. Once Customer Match is exhausted, you push into remarketing and in-market, which still carry high intent. Only when those tiers are optimized do you broaden to affinity or demographic.
The efficiency gain compounds over time. Each tier you activate feeds data back into Google's models, improving their targeting. In-market audiences refine themselves as you spend. Affinity audiences get smarter. Your cold audience work teaches the algorithm which demographic segments actually buy, so the demographic tier gets less wasteful as you climb. Layering all tiers forces you to optimize from hot to cold, which is the opposite of how most budgets flow.