Herfindahl index
Herfindahl-Hirschman Index , HHI (skrót)

Herfindahl index is the measure of concentration that these Guidelines state that will be used.

The "number of effective competitors" is the inverse of the Herfindahl index.

The Herfindahl index for these two situations makes the lack of competition in the second case strikingly clear:

The Herfindahl index provides a more complete picture of industry concentration than does the concentration ratio.

The major benefit of the Herfindahl index in relationship to such measures as the concentration ratio is that it gives more weight to larger firms.

The Lerner index and Herfindahl index may be used to measure market power.

There is also a normalised Herfindahl index.

Web tool for calculating pre- and post-merger Herfindahl index.

Alternatively, there is the Herfindahl index.

Decreases in the Herfindahl index generally indicate a loss of pricing power and an increase in competition, whereas increases imply the opposite.

In 1965, the Herfindahl index of horizontal integration for the crude oil production industry was 1600 and the horizontal integration for the exploration industry was 1250.

Commonly used market concentration measures are the Herfindahl index (HHI or simply H) and the concentration ratio (CR).

The Herfindahl index and the concentration ratios focus on the market shares of companies, but these measures identify the "pivotalness" of companies to meeting the demand on the system.

Whereas the Herfindahl index ranges from 1/N to one, the normalized Herfindahl index ranges from 0 to 1.

On a monthly basis, EXAA is publishing the Market concentration data for the EXAA Spot (based on the Herfindahl index).

The Antitrust Division of the Department of Justice considers Herfindahl indices between 0.1500 and 0.2500 to be moderately concentrated and indices above 0.2500 to be highly concentrated.

As a result, the same measure is usually known as the Simpson index in ecology, and as the Herfindahl index or the Herfindahl-Hirschman index (HHI) in economics.

The Herfindahl index (also known as Herfindahl-Hirschman Index, or HHI) is a measure of the size of firms in relation to the industry and an indicator of the amount of competition among them.

As part of its merger review process, Mexican Competition Commission uses dominance index (ID), described as the Herfindahl index of a Herfindahl index (HHI).

In 1982, Associate Attorney General Bill Baxter, under the authority of U.S. Attorney General William French Smith, released a new set of guidelines, which made heavier use of modern concepts of microeconomic theory, including the using the Herfindahl index to determine market concentration.

The United States Federal anti-trust authorities such as the Department of Justice and the Federal Trade Commission use the Herfindahl index as a screening tool to determine whether a proposed merger is likely to raise antitrust concerns [increases of over 0.0100 points generally provoke scrutiny, although this varies from case to case.