BROADCAST MEDIA INDUSTRY
"Five conservative companies own 90% of the media in America." — per talk show host Ed Schultz
PERSONAL COMPUTER INDUSTRY
Microsoft has 90% of the personal computer market, though hundreds of other vendors make the products & get the revenue. Poor Apple/Mac is still only 10% of the PC market; their main business is now the fantastically successful iPod.
PETROLEUM INDUSTRY
As for the U.S. petroleum monopoly, five companies control 56.3% of the market and the top ten companies own 83.3% (per January 2006 Senate testimony by Tyson Slocum of Public Citizen).
The breakdown for 2004 is as follows:
Conoco-Phillips et al 13%
Valero-Shamrock 12.8%
Exxon-Mobil 11.9%
Shell et al 9.8%
B.P. 8.8%
Chevron-Texaco-Unocal 5.9%
Citgo 5.8%
Marathon 5.5%
Sunoco 5.3%
Koch-Flint Hills 4.5%
... for a total of 83.3%, leaving independent oil companies with only 16.7% !!
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