A Meta-Analysis of Brand Extension Success: The Effects of Parent Brand Equity and Extension Fit.

01 Why it matters.

The largest meta-analysis of brand extension research available as of 2026. Peng and colleagues analysed decades of studies across hundreds of extension attempts to identify the factors that predict success. Their finding — that both parent brand equity and extension fit matter significantly and independently, with perceived fit being the more controllable variable — is the most precise answer to the question every luxury house contemplating diversification faces.

This paper is the theoretical foundation for our analysis of Bulgari Hotels. It explains why Bulgari’s extension into hospitality succeeded where many comparable attempts have failed: not because Bulgari had the strongest brand equity, but because the fit between jewellery identity and ultra-luxury hospitality — rare materials, exceptional craft, Italian design heritage, spatial sensory experience — was genuinely legible to consumers.

02 Key takeaways.

1. 01 Both parent brand equity and extension fit significantly and independently predict extension success.
2. 02 Perceived fit is the more controllable variable — it can be shaped through product design, communication, and market entry approach.
3. 03 High equity without fit is insufficient; brands with strong equity still fail when the extension category is perceived as incongruent.
4. 04 Consumer perception of fit, not objective similarity, is what matters — the brand must translate its identity into the new category in a way consumers can recognise.
5. 05 Extensions that fail can damage parent brand equity, particularly when the failure is public and the brand has high prior equity.

03 Used in our research.

1. 01 Case StudyBulgari Hotels: When a Jeweller Becomes a Place