Single-Touch Models and Their Distortions

First-touch attribution gives all credit to the channel that created the initial contact. Last-touch attribution gives all credit to the channel that converted the deal. Both are simple, easy to implement, and fundamentally wrong. A prospect who first encountered your brand through a blog post (first touch) and eventually booked a meeting through an SDR email (last touch) was influenced by every touchpoint in between. Crediting only one of those touchpoints is like crediting only the last mile of a road trip for getting you to the destination.

1. First-Touch Bias First-touch attribution over-credits top-of-funnel channels: content marketing, SEO, social media, and advertising. It under-credits bottom-of-funnel channels: SDR outreach, sales emails, and events. The distortion directs investment toward awareness channels and away from conversion channels, producing a funnel that is wide at the top and leaky at the bottom.
2. Last-Touch Bias Last-touch attribution over-credits bottom-of-funnel channels: SDR sequences, sales calls, and direct requests. It under-credits the content, advertising, and brand awareness that made the prospect receptive to the outbound touch in the first place. The distortion directs investment toward conversion activities and away from the awareness activities that fill the funnel.
3. When Single-Touch Is Acceptable Single-touch models are acceptable when you have limited data infrastructure, are early in your demand generation maturity, or need a quick directional signal. First-touch tells you where new names come from. Last-touch tells you what converts. Both are useful as directional indicators — but neither should be the sole basis for budget allocation.