Info

Note: n.a. means not available. Data withheld to avoid disclosing information for individual companies. Data source: U.S. Census Bureau, 1997 census, May 24, 2001.

Note: n.a. means not available. Data withheld to avoid disclosing information for individual companies. Data source: U.S. Census Bureau, 1997 census, May 24, 2001.

concentration ratios

Data that show the percentage market share held by a group of leading firms clusters of top firms. These group market share data are called concentration ratios because they measure the percentage market share concentrated in (or held by) an industry's top four (CR4), eight (CR8), 20 (CR20), or 50 (CR50) firms. Thus, the concentration ratio for a group of n leading firms is defined in percentage terms as:

X Firm Sales;

n Industry Sales

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