---
title: "Herfindahl-Hirschman index: formula and 12 recent papers"
description: "Herfindahl-Hirschman index was mentioned in 12 papers in the last 30 days (2026-09-27 to 2026-10-26), ranking #62 of the 104 equations and models mentioned."
url: https://scholar4ai.com/equations/herfindahl-hirschman-index
markdown_url: https://scholar4ai.com/equations/herfindahl-hirschman-index.md
license: CC BY-NC 4.0 (https://creativecommons.org/licenses/by-nc/4.0/)
data_url: https://scholar4ai.com/data/rankings.json
updated: 2026-10-26T13:22:50+09:00
window: 2026-09-27 to 2026-10-26
source: OpenAlex (CC0)
---

# Herfindahl-Hirschman index

$$
\mathit{HHI} = \sum_{i=1}^{N} s_i^2
$$

Market concentration as the sum of squared market shares.

- area: Labour, inequality and competition
- 0 papers in the last 7 days
- Names searched for: Herfindahl, HHI

Back to the ranking: https://scholar4ai.com/rankings/equations.md

## Key findings

- Herfindahl-Hirschman index was mentioned in 12 papers in the last 30 days (2026-09-27 to 2026-10-26), ranking #62 of the 104 equations and models mentioned.
- By journal category: Finance (8), Management (3) and Operations Research (1).
- Most of them appeared in International Review of Economics & Finance (3), Financial Innovation (1) and The Quarterly Review of Economics and Finance (1).
- Often mentioned together with Instrumental variables (two-stage least squares) (6), Ordinary least squares (OLS) (6) and Difference-in-differences (4).
- Datasets named in the same papers: OR-Library (3), CSMAR (2) and Marketization index (Fan Gang) (2).
- From Apr 2024 to Sep 2026, 28 archived papers mentioned Herfindahl-Hirschman index in their title, abstract or keywords, most of them in Sep 2026 (6).

## Mentions over 30 months

*Papers mentioning it by publication month, Apr 2024 to Sep 2026 (titles, abstracts and keywords)*

| Trend | Apr 24–Sep 24 | Oct 24–Sep 25 | Oct 25–Sep 26 | 30 months |
|---|---:|---:|---:|---:|
|  | 8 | 13 | 7 | 28 |

*Papers mentioning Herfindahl-Hirschman index, newest first.*

| Date | Title | Journal | Authors | Affiliations |
|---|---|---|---|---|
| 2026-10-16 | [Public technical disclosure of AI implementation in finance: Python-framed evidence from 253 NYSE-listed financial companies](https://doi.org/10.1186/s40854-026-00979-w) | [Financial Innovation](https://scholar4ai.com/journals/financial-innovation.md) | Veliota Drakopoulou | Embry–Riddle Aeronautical University |
| 2026-10-10 | [Does social media deployment by local governments raise voters’ offline engagement – Evidence from the German state of Hesse](https://doi.org/10.1016/j.qref.2026.102247) | [The Quarterly Review of Economics and Finance](https://scholar4ai.com/journals/the-quarterly-review-of-economics-and-finance.md) | Abeer Ibtisam Aziz, Ivo Bischoff | University of Kassel |
| 2026-10-09 | [The impact of regional economic growth pressure on CSR disclosure: Evidence from China](https://doi.org/10.1016/j.iref.2026.105959) | [International Review of Economics & Finance](https://scholar4ai.com/journals/international-review-of-economics-finance.md) | Huahong Yan, Mingxuan Zhu, Jing Liu et al. | Capital University of Economics and Business; Shanxi University of Finance and Economics |
| 2026-10-06 | [CSR focus under competitive pressure: The role of national institutions](https://doi.org/10.1016/j.jwb.2026.101784) | [Journal of World Business](https://scholar4ai.com/journals/journal-of-world-business.md) | Limin Fu, Dirk Michael Boehe, Mariano L.M. Heyden | Monash University; Université Mohammed VI Polytechnique |
| 2026-10-05 | [How parent resource allocation shapes group productivity: The contingent role of subsidiary traits](https://doi.org/10.1016/j.iref.2026.105943) | [International Review of Economics & Finance](https://scholar4ai.com/journals/international-review-of-economics-finance.md) | Jianyong Liu, Yizheng Wu, Wei Zhang et al. | China University of Mining and Technology; Shanghai University of International Business and Economics |
| 2026-10-05 | [Sailing on trust: The impact of social credit system construction on corporate ESG performance](https://doi.org/10.1016/j.iref.2026.105944) | [International Review of Economics & Finance](https://scholar4ai.com/journals/international-review-of-economics-finance.md) | Zhiqiang Bian, Caibin Zhang | Shandong Institute of Business and Technology; Liaoning University |
| 2026-10-01 | [Addressing Grand Challenges through transdisciplinary research collaborations between universities and the arts and cultural sector](https://doi.org/10.1016/j.jengtecman.2026.102015) | [Journal of Engineering and Technology Management](https://scholar4ai.com/journals/journal-of-engineering-and-technology-management.md) | Federica Rossi, Ning Baines, Evelyn Wilson | University of Modena and Reggio Emilia; University of Leicester; University of London; … |
| 2026-10-01 | [Reopening is not Recovery: Institutional Hysteresis in the Libyan Stock Market](https://doi.org/10.1016/j.bir.2026.100920) | [Borsa Istanbul Review](https://scholar4ai.com/journals/borsa-istanbul-review.md) | Suliman Alshahmy, Charilaos Mertzanis | Heriot-Watt University Dubai; Libyan Academy; Abu Dhabi University |
| 2026-10-01 | [Structural concentration in weighted networks: A class of topology-aware indices](https://doi.org/10.1016/j.ejor.2026.10.009) | [European Journal of Operational Research](https://scholar4ai.com/journals/european-journal-of-operational-research.md) | Luigi Riso, M. G. Zoia | Università Cattolica del Sacro Cuore |
| 2026-09-29 | [Crowded home: Competitive positioning, internationalization, and firm performance](https://doi.org/10.1016/j.intman.2026.101430) | [Journal of International Management](https://scholar4ai.com/journals/journal-of-international-management.md) | Prakash Raj Paudel, Pengfei Wang | BI Norwegian Business School; University of South-Eastern Norway |
| 2026-09-29 | [Skilled labor mobility and bank default](https://doi.org/10.1016/j.jfs.2026.101599) | [Journal of Financial Stability](https://scholar4ai.com/journals/journal-of-financial-stability.md) | Yuna Heo, Akif Midilli, Steven R. G. Ongena | University of Basel; Swiss Finance Institute; University of Zurich; … |
| 2026-09-27 | [Bank market power and corporate stock price crash risk: borrowers’ manipulation incentives](https://doi.org/10.1016/j.intfin.2026.102407) | [Journal of International Financial Markets Institutions and Money](https://scholar4ai.com/journals/journal-of-international-financial-markets-institutions-and-money.md) | Shengfeng Li, Liang Han, Biao Mi | University of Sheffield; Dongbei University of Finance and Economics; University of Surrey; … |

## Cite this page

Scholar4AI. (2026). Herfindahl-Hirschman index. Journal Research Rankings. Retrieved October 26, 2026, from https://scholar4ai.com/equations/herfindahl-hirschman-index

```bibtex
@misc{scholar4ai-equations-herfindahl-hirschman-index,
  author = {{Scholar4AI}},
  title = {Herfindahl-Hirschman index},
  year = {2026},
  howpublished = {\url{https://scholar4ai.com/equations/herfindahl-hirschman-index}},
  urldate = {2026-10-26},
  note = {Journal Research Rankings; data from OpenAlex (CC0); licensed CC BY-NC 4.0}
}
```

License: CC BY-NC 4.0 (https://creativecommons.org/licenses/by-nc/4.0/).