Without googling, do you know what the the Herfindahl-Hirschman Index (HHI) is?
October 11, 2025 at 2:55 PM
Without googling, do you know what the the Herfindahl-Hirschman Index (HHI) is?
All this ignores what had been the standard anti-trust metric, the Herfindahl–Hirschman index. By its measure, ALL these industries operate in uncompetitive markets: en.wikipedia.org/wiki/Herfind...
June 15, 2026 at 7:07 PM
All this ignores what had been the standard anti-trust metric, the Herfindahl–Hirschman index. By its measure, ALL these industries operate in uncompetitive markets: en.wikipedia.org/wiki/Herfind...
Here’s what we’re talking about. This academic is using the Herfindahl-Hirschman Index (HHI), which apparently measures market concentration www.investopedia.com/terms/h/hhi..... 2500 or above is considered highly concentrated
June 17, 2026 at 4:50 PM
Here’s what we’re talking about. This academic is using the Herfindahl-Hirschman Index (HHI), which apparently measures market concentration www.investopedia.com/terms/h/hhi..... 2500 or above is considered highly concentrated
In economics terms, the reciprocal of the herfindahl-hirschman index. So effectively a measure of market concentration rescaled back to units of parties en.wikipedia.org/wiki/Effecti...
Effective number of parties - Wikipedia
en.wikipedia.org
November 16, 2024 at 9:19 AM
In economics terms, the reciprocal of the herfindahl-hirschman index. So effectively a measure of market concentration rescaled back to units of parties en.wikipedia.org/wiki/Effecti...
In numbers:
➡ Industries with top 8 firms under reporting obligations, became 2.6 percentage points less concentrated.
➡ Using the Herfindahl-Hirschman Index yields similar results.
These are the first empirical estimates linking tax compliance directly to market structure.
➡ Industries with top 8 firms under reporting obligations, became 2.6 percentage points less concentrated.
➡ Using the Herfindahl-Hirschman Index yields similar results.
These are the first empirical estimates linking tax compliance directly to market structure.
November 7, 2025 at 9:20 AM
In numbers:
➡ Industries with top 8 firms under reporting obligations, became 2.6 percentage points less concentrated.
➡ Using the Herfindahl-Hirschman Index yields similar results.
These are the first empirical estimates linking tax compliance directly to market structure.
➡ Industries with top 8 firms under reporting obligations, became 2.6 percentage points less concentrated.
➡ Using the Herfindahl-Hirschman Index yields similar results.
These are the first empirical estimates linking tax compliance directly to market structure.
Crazy herfindahl-hirschman index
December 21, 2024 at 8:44 PM
Crazy herfindahl-hirschman index
UK cities with higher industrial concentration in 1881 had more unskilled workers in 1971, and much lower average wages in 2020.
July 14, 2025 at 1:04 PM
UK cities with higher industrial concentration in 1881 had more unskilled workers in 1971, and much lower average wages in 2020.
HHI + threshold underestimates risk in diversified markets www.sciencedirect.com/science/arti... #energysky
Evaluating criticality of strategic metals: Are the Herfindahl–Hirschman Index and usual concentration thresholds still relevant?
This paper aims to evaluate the criticality of strategic metals by (i) investigating the validity of the Herfindahl–Hirschman Index (HHI) for assessin…
www.sciencedirect.com
January 30, 2025 at 7:22 PM
HHI + threshold underestimates risk in diversified markets www.sciencedirect.com/science/arti... #energysky
😆 My transcript wrote “empirical base” for “empirical Bayes” and urban Dale for Herfindahl (whose first name is not Dale but Orris!).
December 4, 2024 at 5:47 PM
😆 My transcript wrote “empirical base” for “empirical Bayes” and urban Dale for Herfindahl (whose first name is not Dale but Orris!).
Herfindahl–Hirschman Index (HHI) calculates how centralized a protocol has become by adding the squares of providers' usage share percentages.
- Fediverse is 748 by instance or 3952 by server software, and ATmosphere is 9684
- Web hosting is 744, and Git hosting is 9224
- Fediverse is 748 by instance or 3952 by server software, and ATmosphere is 9684
- Web hosting is 744, and Git hosting is 9224
Are we decentralized yet?
View Article | Join the HN Conversation
Summary of HN discussion 🧵👇 #hacker-news
View Article | Join the HN Conversation
Summary of HN discussion 🧵👇 #hacker-news
Are We Decentralized Yet?
A site with statistics regarding the decentralization status of various web services
arewedecentralizedyet.online
May 28, 2026 at 2:57 PM
Herfindahl–Hirschman Index (HHI) calculates how centralized a protocol has become by adding the squares of providers' usage share percentages.
- Fediverse is 748 by instance or 3952 by server software, and ATmosphere is 9684
- Web hosting is 744, and Git hosting is 9224
- Fediverse is 748 by instance or 3952 by server software, and ATmosphere is 9684
- Web hosting is 744, and Git hosting is 9224
Herfindahl-Hirschman Index)
February 5, 2024 at 2:28 PM
Herfindahl-Hirschman Index)
17/32 Regional Final slots for the Power2 (53%). 5 for ACC and 4 for BIG12. That’s 26/32 (81%) for previous P4. (I don’t need Herfindahl for this one.)
May 18, 2025 at 2:19 PM
17/32 Regional Final slots for the Power2 (53%). 5 for ACC and 4 for BIG12. That’s 26/32 (81%) for previous P4. (I don’t need Herfindahl for this one.)
@mmasnick.bsky.social @Gargron @stinerman @ikuturso @glyph
Not really.
https://mastodon.online/@mastodonmigration/115129998343856795
#mastodon #bluesky #decentralization #decentralizationwashing
Not really.
https://mastodon.online/@mastodonmigration/115129998343856795
#mastodon #bluesky #decentralization #decentralizationwashing
September 8, 2025 at 4:43 PM
Marktkonzentrationsindizes
HHI (Herfindahl-Hirschman-Index): zeigt, ob wenige Anbieter dominieren.
RSI (Residual Supply Index): misst, ob die Nachfrage auch ohne den größten Anbieter gedeckt werden könnte. Werte < 1 deuten auf Marktmacht hin.
HHI (Herfindahl-Hirschman-Index): zeigt, ob wenige Anbieter dominieren.
RSI (Residual Supply Index): misst, ob die Nachfrage auch ohne den größten Anbieter gedeckt werden könnte. Werte < 1 deuten auf Marktmacht hin.
September 10, 2025 at 6:13 AM
Marktkonzentrationsindizes
HHI (Herfindahl-Hirschman-Index): zeigt, ob wenige Anbieter dominieren.
RSI (Residual Supply Index): misst, ob die Nachfrage auch ohne den größten Anbieter gedeckt werden könnte. Werte < 1 deuten auf Marktmacht hin.
HHI (Herfindahl-Hirschman-Index): zeigt, ob wenige Anbieter dominieren.
RSI (Residual Supply Index): misst, ob die Nachfrage auch ohne den größten Anbieter gedeckt werden könnte. Werte < 1 deuten auf Marktmacht hin.
looks pretty much like HHI index, no? en.wikipedia.org/wiki/Herfind...
Herfindahl–Hirschman index - Wikipedia
en.wikipedia.org
November 2, 2025 at 6:49 PM
looks pretty much like HHI index, no? en.wikipedia.org/wiki/Herfind...
There's actually a neat connection between entropy and economics: the Herfindahl–Hirschman index. If you take the reciprocal of the HHI then log it, it should be exactly equal to the Renyi entropy (en.wikipedia.org/wiki/R%C3%A9...).
Rényi entropy - Wikipedia
https://en.wikipedia.org/wiki/Rényi_entropy
May 30, 2025 at 4:18 PM
There's actually a neat connection between entropy and economics: the Herfindahl–Hirschman index. If you take the reciprocal of the HHI then log it, it should be exactly equal to the Renyi entropy (en.wikipedia.org/wiki/R%C3%A9...).
…as well as the Herfindahl-Hirschman Index, another common measure of market concentration, chart @goldmansachsgroup.bsky.social
December 31, 2024 at 7:13 AM
…as well as the Herfindahl-Hirschman Index, another common measure of market concentration, chart @goldmansachsgroup.bsky.social
Domestic electricity supply concentration hits 2012 levels as generation market fragments
No cost is created or moved. This is a statistical release. The concentration trend matters to domestic consumers, who face a narrower choice of suppliers...
https://www.doloop.energy/item/4887d63ccdc776e1
No cost is created or moved. This is a statistical release. The concentration trend matters to domestic consumers, who face a narrower choice of suppliers...
https://www.doloop.energy/item/4887d63ccdc776e1
Domestic electricity supply concentration hits 2012 levels as generation market fragments
DESNZ's 2025 competition statistics show domestic electricity supply concentrating fast: the Herfindahl-Hirschman Index, a concentration score from 0 to 10,000, rose from 1,190.97 in 2023 to 1,616.52
www.doloop.energy
September 30, 2026 at 1:03 PM
Domestic electricity supply concentration hits 2012 levels as generation market fragments
No cost is created or moved. This is a statistical release. The concentration trend matters to domestic consumers, who face a narrower choice of suppliers...
https://www.doloop.energy/item/4887d63ccdc776e1
No cost is created or moved. This is a statistical release. The concentration trend matters to domestic consumers, who face a narrower choice of suppliers...
https://www.doloop.energy/item/4887d63ccdc776e1
USDA has this pull-out chart from a report on the food industry that explains the incredible concentration of food retailers.
www.ers.usda.gov/data-product...
www.ers.usda.gov/data-product...
Food retailing market concentration increased more at national level than county level over past three decades
The U.S. food retail sector experienced substantial consolidation and structural change over the last three decades. Market concentration, as measured by the Herfindahl-Hirschman Index (HHI), is a mea...
www.ers.usda.gov
December 12, 2024 at 2:19 PM
USDA has this pull-out chart from a report on the food industry that explains the incredible concentration of food retailers.
www.ers.usda.gov/data-product...
www.ers.usda.gov/data-product...
E.g. the Herfindahl index (concentration) of the academic affiliation of #Nobel laureats in #Chemistry, #Physics and #Medicine has been declining, while in #economics it has been shockingly increasing ---with half of the laureates’ academic time spent at only 3.3% of all institutions with awards.
August 27, 2024 at 9:59 AM
E.g. the Herfindahl index (concentration) of the academic affiliation of #Nobel laureats in #Chemistry, #Physics and #Medicine has been declining, while in #economics it has been shockingly increasing ---with half of the laureates’ academic time spent at only 3.3% of all institutions with awards.
"Economics has an elitism problem." Ya think?
(HHI = Herfindahl-Hirschman Index value, commonly used to measure industries' concentration of firms, for example.)
hanzhezhang.github.io/research/240...
(HHI = Herfindahl-Hirschman Index value, commonly used to measure industries' concentration of firms, for example.)
hanzhezhang.github.io/research/240...
October 30, 2025 at 1:58 PM
"Economics has an elitism problem." Ya think?
(HHI = Herfindahl-Hirschman Index value, commonly used to measure industries' concentration of firms, for example.)
hanzhezhang.github.io/research/240...
(HHI = Herfindahl-Hirschman Index value, commonly used to measure industries' concentration of firms, for example.)
hanzhezhang.github.io/research/240...
You need landlords who, together control like 20-30% of a market to meaningfully impact prices. You need much larger scale collusion to enter monopoly territory than your SF example. DOJ considers a market with an HHI of less than 1,500 to be competitive. See: www.investopedia.com/terms/h/hhi....
Herfindahl-Hirschman Index (HHI): Definition, Formula, and Example
The Herfindahl-Hirschman Index (HHI) measures market concentration and is used to determine market competitiveness.
www.investopedia.com
April 16, 2026 at 5:41 AM
You need landlords who, together control like 20-30% of a market to meaningfully impact prices. You need much larger scale collusion to enter monopoly territory than your SF example. DOJ considers a market with an HHI of less than 1,500 to be competitive. See: www.investopedia.com/terms/h/hhi....
The Herfindahl neutral point: A firm-level threshold for managing market concentration with evidence from US hog packing onlinelibrary.wiley.com/doi/abs/10.1002/ajae.70074 a new article in @AJAE-aaea.
May 7, 2026 at 3:57 PM
The Herfindahl neutral point: A firm-level threshold for managing market concentration with evidence from US hog packing onlinelibrary.wiley.com/doi/abs/10.1002/ajae.70074 a new article in @AJAE-aaea.
3/n We created a measure of competitiveness in each local market (the standard Herfindahl index) and it gave us this beautiful spatial distribution of media competition
April 29, 2026 at 5:21 PM
3/n We created a measure of competitiveness in each local market (the standard Herfindahl index) and it gave us this beautiful spatial distribution of media competition
The recent measurement of 179 remote Model Context Protocol (MCP) endpoints across two public registries disclosed a high Herfindahl concentration, revealing that the dominant interface for connecting autonomous agents to external data sources and execution environments…
September 18, 2026 at 12:31 AM
The recent measurement of 179 remote Model Context Protocol (MCP) endpoints across two public registries disclosed a high Herfindahl concentration, revealing that the dominant interface for connecting autonomous agents to external data sources and execution environments…