Skip to search
Skip to main content
Search in
Keyword
Title (keyword)
Author (keyword)
Subject (keyword)
Title starts with
Subject (browse)
Author (browse)
Author (sorted by title)
Call number (browse)
search for
Search
Advanced Search
Bookmarks
(
0
)
Princeton University Library Catalog
Start over
Cite
Send
to
SMS
Email
EndNote
RefWorks
RIS
Printer
Bookmark
The Anatomy of Concentration: New Evidence From a Unified Framework / Kenneth R. Ahern, Lei Kong, Xinyan Yan.
Author
Ahern, Kenneth R.
[Browse]
Format
Book
Language
English
Published/​Created
Cambridge, Mass. National Bureau of Economic Research 2024.
Description
1 online resource: illustrations (black and white);
Details
Related name
National Bureau of Economic Research
[Browse]
Kong, Lei
[Browse]
Yan, Xinyan
[Browse]
Series
Working Paper Series (National Bureau of Economic Research) no. w32057.
[More in this series]
NBER working paper series no. w32057
Summary note
Concentration is a single summary statistic driven by two opposing forces: the number of firms in a market and the evenness of their market shares. This paper introduces a generalized measure of concentration that allows researchers to vary the relative importance of each force. Using the generalized measure, we show that the widely-cited evidence of increasing industrial employment concentration is driven by the Herfindahl Index's over-weighting of evenness and under-weighting of firm counts. We propose an alternative, equally-weighted measure that has an equivalent economic meaning as the Herfindahl Index, but possesses superior statistical attributes in typical firm size distributions. Using this balanced measure, we find that employment concentration decreased from 1990 to 2020. Finally, decomposing aggregate diversity into meaningful geographic and industry subdivisions reveals that concentration within regional markets has fallen, while concentration between markets has risen.
Notes
January 2024.
Source of description
Print version record
Statement on responsible collection description
Princeton University Library aims to describe library materials in a manner that is respectful to the individuals and communities who create, use, and are represented in the collections we manage.
Read more...
Other views
Staff view
Ask a Question
Suggest a Correction
Supplementary Information