Tuesday, November 13, 2012

The Growth Of Monopoly Power

http://thesocietypages.org/socimages/2012/11/13/the-growth-of-monopoly-power/
Percentage of Sales for Four Largest Firms in Selected U.S. Retail Industries:
Industry (NAICS code)  1992    1997    2002    2007
Food & beverage stores (445)  15.4    18.3    28.2    27.7
Health & personal care stores (446)  24.7    39.1    45.7    54.4
General merchandise stores (452)  47.3    55.9    65.6    73.2
Supermarkets (44511)  18.0    20.8    32.5    32.0
Book stores (451211)  41.3    54.1    65.6    71.0
Computer & software stores (443120)  26.2    34.9    52.5    73.1

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