Last-Click Attribution
An attribution model that credits the entire conversion to the last affiliate link clicked before a purchase. While simple, it can undervalue affiliates who introduce customers earlier in the buyer journey.
Understanding Last-Click Attribution
Last-click attribution credits the final touchpoint before conversion to the conversion. If a customer reads a blog post (source 1), clicks an email link (source 2), then converts from paid search ad (source 3), last-click attribution gives 100% credit to the paid search ad. This model is simple to track but distorts multi-touch customer journeys. Last-click attribution systematically undervalues affiliate programs because affiliates often appear early in customer journey, not at final click.
Problems with Last-Click Attribution
Last-click attribution penalizes content marketing and awareness channels while over-crediting bottom-funnel channels. Imagine customer awareness journey: discovers product through affiliate review (click 1), reads 3 blog articles (clicks 2-4), clicks affiliate email (click 5), clicks retargeting ad (click 6), then converts. Last-click attribution credits retargeting ad with 100% conversion value, ignoring that affiliate introduced the product and remained engaged throughout journey. This causes companies to defund affiliate programs despite strong performance. Studies show last-click attribution understates multi-touch channel contribution by 30-50%.
Moving Beyond Last-Click Attribution
Implement multi-touch attribution models fairly crediting multiple touchpoints. Linear attribution gives equal weight to all touchpoints. Time-decay attribution weights recent touches heavier while acknowledging earlier touches. First-click attribution credits initial touchpoint. Position-based attribution weights first and last clicks heavier while distributing remaining credit. For affiliate programs, adopt attribution model recognizing both initial awareness (affiliate introduction) and ongoing engagement. Compare affiliate performance across different attribution models—affiliate likely performs stronger under multi-touch attribution. Use analytics platforms like Mixpanel, Amplitude, or Segment supporting custom attribution modeling. Build custom attribution logic matching your actual customer journey. Survey customers about how they discovered your product—research shows customer perception of influencing factors often doesn't match digital tracking data.
