Given a market share of a set of companies, this determines the Herfindahl Index and Normalized Herfindahl Index.

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_{1}^{N}Σs_{i}^{2}where_{i}is the market share percentage and N = Number of Companies

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- herfindahl index
- market
- a place where buyers and sellers can meet to facilitate the exchange or transaction of goods and services.
- percentage
- a specified amount in or for every hundred. one part in every hundred.