Measurement
Halo Effect
Positive spillover impact of one marketing channel on another, often unmeasured by attribution models.
Halo Effect is when one channel boosts another's performance. Examples: TV ads increase branded search volume (TV creates awareness → Users search on Google), Display ads improve email open rates (brand familiarity increases engagement), and Influencer marketing boosts organic social (followers discover brand → Follow on Instagram). Why attribution misses it: Last-click gives credit to Google Search, ignoring TV's role. Multi-touch helps but still undervalues awareness channels. Measurement: Brand search lift analysis, Incrementality testing (measure total impact), and Marketing Mix Modeling (captures cross-channel effects). Halo effects are largest for awareness channels (TV, display, influencer) benefiting conversion channels (search, email, retargeting).