Skip to content
Dictionary by pitch.dog
Markets, industries & categories · Specialist

Herfindahl-Hirschman Index

Also called: HHI

ELI5

A number showing how concentrated a market is.

Used in conversation

“The HHI rises materially after the proposed merger.”

Definition

A market-concentration measure calculated by summing the squares of firms' market shares.

Here “Herfindahl-Hirschman Index” means: A market-concentration measure calculated by summing the squares of firms' market shares.

Pitch context

You will see “Herfindahl-Hirschman Index” in strategy decks, market analyses, business plans and planning workshops when the discussion reaches markets, industries & categories.

Why it matters: It helps a reader interpret markets, industries & categories without confusing the measure, decision, role or evidence being discussed.

When the words have to travel

Need an investor or company deck?

Bring the business, the evidence or the half-formed ask. We help it travel beyond the spreadsheet.

See how pitch.dog can help
Sources & evidence · 5

Supporting source families. This entry is an editorial synthesis rather than a quotation from one canonical glossary.