Macroeconomics
Media Ownership Concentration Calculator
Calculate a simplified Herfindahl-Hirschman concentration index from four major media-owner shares and the residual market.
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Media Ownership Concentration: Calculate a simplified Herfindahl-Hirschman concentration index from four major media-owner shares and the residual market.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Media Ownership Concentration to answer this question: calculate a simplified herfindahl-hirschman concentration index from four major media-owner shares and the residual market? Enter Largest owner market share, Second owner market share, Third owner market share, and 2 other inputs; the calculator shows Simplified media ownership HHI. Try changing one number and watch what happens to Simplified media ownership HHI. The answer tells you Simplified media ownership HHI.
Age 15Explain it to a 15-year-oldConnect it to the formula
Audience, revenue, distribution and local-news markets may produce different concentration conclusions. The rule is HHI = sum of squared market shares. Its input values are Largest owner market share (%), Second owner market share (%), Third owner market share (%), Fourth owner market share (%), Number of equal residual owners, and the main result is Simplified media ownership HHI. Try changing one number and watch what happens to Simplified media ownership HHI.
CollegeExplain it at college levelState the model precisely
This calculator evaluates a macroeconomics relationship while holding unmodelled conditions constant. The implemented relation is HHI = sum of squared market shares, evaluated from Largest owner market share (%), Second owner market share (%), Third owner market share (%), Fourth owner market share (%), Number of equal residual owners to produce Simplified media ownership HHI. Audience, revenue, distribution and local-news markets may produce different concentration conclusions. The result depends on comparable definitions, units, populations and time periods. It estimates a relationship; it does not establish causation or replace current primary data.
The economic question
Calculate a simplified Herfindahl-Hirschman concentration index from four major media-owner shares and the residual market.
Why this relationship is useful
Audience, revenue, distribution and local-news markets may produce different concentration conclusions.
Inputs that must be comparable
- Largest owner market share measured in %.
- Second owner market share measured in %.
- Third owner market share measured in %.
- Fourth owner market share measured in %.
- Number of equal residual owners.
Use one market, firm, population and time period throughout; mixing definitions can make a correctly calculated number economically meaningless.
The model
HHI = sum of squared market shares
From inputs to output
The calculator combines Largest owner market share, Second owner market share, Third owner market share, Fourth owner market share, Number of equal residual owners and reportsSimplified media ownership HHI together with Residual market share, Equal residual owner share. Change one assumption at a time to identify what actually drives the estimate.
How to read Simplified media ownership HHI
Read the sign, magnitude, unit and period together. The result quantifies the relationship in “calculate a simplified herfindahl-hirschman concentration index from four major media-owner shares and the residual market”; it does not by itself prove that one input caused another.
Where interpretation can fail
Do not use the result when the input definitions, units or formula assumptions do not match the real situation. This is an educational model, not financial, investment, tax or policy advice; verify material decisions against primary data and professional guidance.
Supporting sourcesAcademic referencesPrimary standards, textbooks and complete citations
Standards, reading and academic references
Use the calculator as the worked interaction, then consult the primary standards and academic textbooks listed below. MW SysArc links to the original sources; the explanation on this page is original and does not reproduce them.
Principles of Economics 3e
Read the free OpenStax economics textbookCite this book
- APA 7
- Greenlaw, S. A., Shapiro, D., & MacDonald, D. (2022). Principles of economics 3e. OpenStax. https://openstax.org/books/principles-economics-3e/pages/1-introduction
- MLA 9
- Greenlaw, Steven A., et al. Principles of Economics 3e. OpenStax, 2022, https://openstax.org/books/principles-economics-3e/pages/1-introduction.
- Chicago author-date
- Greenlaw, Steven A., David Shapiro, and Daniel MacDonald. 2022. Principles of Economics 3e. Houston, TX: OpenStax. https://openstax.org/books/principles-economics-3e/pages/1-introduction.
OpenStax entries are free to read online. Follow the licence shown on each linked source before redistributing or adapting its content.
Reuse the page responsiblyCite this pageAPA, MLA, Chicago, Harvard, BibTeX and RIS
These formats cite this calculator page itself. They are separate from the academic references above, which support the mathematical method and terminology.
APA 7
MW SysArc. (2026, July 21). Media Ownership Concentration Calculator. MW SysArc Tools. https://economics.mwsysarc.com/macro/media-ownership-concentration
MLA 9
MW SysArc. “Media Ownership Concentration Calculator.” MW SysArc Tools, 21 July 2026, https://economics.mwsysarc.com/macro/media-ownership-concentration. Accessed 30 Aug. 2026.
Chicago 17
MW SysArc. “Media Ownership Concentration Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 30, 2026. https://economics.mwsysarc.com/macro/media-ownership-concentration.
Harvard
MW SysArc (2026) ‘Media Ownership Concentration Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://economics.mwsysarc.com/macro/media-ownership-concentration (Accessed: 30 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_media_ownership_concentration_2026,
author = {{MW SysArc}},
title = {Media Ownership Concentration Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://economics.mwsysarc.com/macro/media-ownership-concentration},
note = {Published July 21, 2026; accessed August 30, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Media Ownership Concentration Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-30
UR - https://economics.mwsysarc.com/macro/media-ownership-concentration
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Media Ownership Concentration do?
Calculate a simplified Herfindahl-Hirschman concentration index from four major media-owner shares and the residual market.
How does the Media Ownership Concentration work?
The calculator applies this formula: HHI = sum of squared market shares. Audience, revenue, distribution and local-news markets may produce different concentration conclusions.
What can I learn from the Media Ownership Concentration?
It helps you explore the relationship described by this tool: Calculate a simplified Herfindahl-Hirschman concentration index from four major media-owner shares and the residual market. Change one input at a time to observe how it affects the result.
Does MW SysArc receive or store what I enter?
No. The calculation runs locally in your browser. MW SysArc does not receive or store your calculation inputs.
How should I use the result?
Use the result as an estimate or educational aid. Check important financial, business or policy decisions with qualified sources and current data.
Last reviewed . Calculations tested .