Giandrea, Michael D. (contributor) - 2006
-Hirschman (HH) index. The HH index is calculated as the sum of
squared market shares of each company within an industry. The HH … takes a
maximum value of 10,000 when one company produces the entire industry output
and a minimum value approaching zero … data are aggregated to the
company level since an establishment level HH index would be artificially low as
in the …