---
id: "claim-fast-inventory-negates-billboard"
type: "claim"
source_timestamps: ["§ Distance has a U-shaped impact", "¶12", "¶20"]
tags: ["retail-category", "inventory-management"]
related: ["concept-billboard-effect", "entity-macys", "entity-jcpenney"]
confidence: "medium"
testable: true
speakers: ["Bowen Luo", "Bhoomija Ranjan"]
sources: ["tail1"]
sourceVaultSlug: "hbr-seg-tail1"
originDay: 1
articleStem: "hbr-tail-115-location-based-advertising"
sourceUrl: "https://hbr.org/2026/03/a-better-strategy-for-location-based-advertising"
sourceTitle: "A Better Strategy for Location-Based Advertising"
---
# Fast-changing inventory negates the billboard effect

**Claim (author confidence: MEDIUM; testable):** In retail categories where assortments are **refreshed frequently** — department stores like [[entity-macys]] or [[entity-jcpenney]] — even nearby customers face **uncertainty about what is currently in stock**. In these cases the conventional pattern holds: **closer customers are more responsive** to ads because travel cost is the dominant factor and the [[concept-billboard-effect]] is weak.

This is the exception that qualifies the [[concept-inverted-u-shape]]: the donut applies to *stable*-assortment categories; fast-inventory categories revert toward monotonic "closer = more responsive."

## Verification status (enrichment)
- **Mechanism — plausible:** rapid inventory change genuinely increases the informational value of ads for nearby customers, so the "they already know everything" premise of the billboard effect breaks down.
- **Strong version — medium-confidence and study-specific:** no open study confirms monotonic (closer = more responsive) ad lift in department-store categories by inventory volatility. The authors' own **medium** confidence is appropriate.