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	Diversification-Performance Analysis (Rumelt Categories)	Herfindahl Diversification Index
Dziedzina	Zarządzanie strategiczne	Zarządzanie strategiczne
Rodzina	Process / pipeline	Process / pipeline
Rok powstania	1974	1979
Twórca	Richard P. Rumelt; Krishna Palepu	Alexis Jacquemin & Charles Berry; Krishna Palepu
Typ	Classification-and-comparison pipeline relating diversification type to firm performance	Continuous index of corporate diversification with related/unrelated decomposition
Źródło pierwotne	Rumelt, R. P. (1974). Strategy, Structure, and Economic Performance. Division of Research, Graduate School of Business Administration, Harvard University. ISBN: 9780875841090	Jacquemin, A. P., & Berry, C. H. (1979). Entropy measure of diversification and corporate growth. The Journal of Industrial Economics, 27(4), 359-369.
Inne nazwy	Rumelt Diversification Category Analysis, Related vs Unrelated Diversification Analysis, Corporate Diversification Strategy Classification, Diversification Strategy-Performance Linkage	Entropy Measure of Diversification, Corporate Diversification Index, Jacquemin-Berry Entropy Index, Berry-Herfindahl Diversification Measure
Pokrewne	3	3
Podsumowanie	Diversification-performance analysis asks whether the kind of diversification a firm pursues — staying focused, expanding into related businesses, or building an unrelated conglomerate — is systematically associated with how well the firm performs. The categorical version originates with Rumelt's 1974 Strategy, Structure, and Economic Performance, which classified diversified firms by specialization and relatedness ratios into single-business, dominant-business, related, and unrelated types and found that related diversifiers tended to outperform unrelated ones. Palepu's 1985 study reframed diversification with the continuous Jacquemin-Berry entropy measure, again finding that related diversification was associated with superior profit growth, and showed how the index approach and Rumelt's categorical method can be combined to gain both objectivity and conceptual richness.	The Herfindahl diversification index and its entropy cousin turn a firm's spread across businesses into a single continuous number, with the decisive advantage that the entropy form can be cleanly split into related and unrelated diversification. The Herfindahl-based measure is one minus the sum of squared segment revenue shares; the entropy measure, introduced for diversification by Jacquemin and Berry in 1979, is the share-weighted sum of the logged inverse shares. Jacquemin and Berry's key contribution was showing that total entropy decomposes additively into within-industry-group (related) and between-group (unrelated) components. Palepu's 1985 study applied this entropy decomposition to strategic management, finding that related diversification was associated with superior profit growth and giving the field an objective, replicable alternative to categorical schemes.