March, 2026 Why Last-Click Attribution Is Killing Your Marketing ROI

Last-click attribution is seductive in its simplicity. A prospect clicks a paid search ad, fills out a demo form, and closes 90 days later. The model celebrates the ad. The attribution report declares victory. The budget flows to paid search. But here is what that model never tells you: that same prospect read six blog posts over four months, attended a webinar, consumed a competitor comparison page, and received three nurture emails before that final click ever happened.

Every touchpoint upstream did the heavy lifting. Last-click got the trophy. This is not a minor measurement gap. It is a systematic distortion that compounds with every budget cycle, every campaign decision, and every executive review where incomplete data drives confident, wrong conclusions.