[Trajan]

Another good example of a multi-national corp. dominating it's verticle market areas is ConAgra Foods. To quote Hoovers.com

It is the #2 US food company (behind Philip Morris' Kraft Foods). ConAgra Foods is #2 in US frozen foods (behind Nestlé USA), and with brands including Butterball and Armour, is #2 in US meat and poultry sales (after Tyson's IBP). It is one of the country's largest food service suppliers and offers shelf-stable foods, seafood, and dairy products. More than 30 of its brands, including Banquet, Chef Boyardee, Healthy Choice, and Van Camp's, each top $100 million in annual sales. ConAgra also makes and distributes agricultural products and food ingredients; mills flour and corn; and trades food commodities.

Don't Forget Procter and Gamble...now there is another big guy. Again from Hoovers

P&G is the #1 US maker of household products, with 300 brands in five main categories: laundry and cleaning (detergents), paper goods (toilet paper), beauty care (cosmetics, shampoos), food and beverages (coffee, snacks), and health care (toothpaste, medicine). It also makes Iams premium pet food and PUR water filters and produces the soap operas Guiding Light and As the World Turns. About half of P&G's sales come from its top ten brands; it is shedding weaker brands that don't have long-term growth potential. The company bought hair products giant Clairol (Nice & Easy, Herbal Essences, Aussie) from Bristol-Myers Squibb.

Cheers!
Trajan