The Fortune 1000 companies control about 70 percent of the American economy. Just 200 corporations conduct almost a third of the entire planet's economic activity and employ less than one-quarter of one percent of the world's workforce.
Source: Hartmann, Thom. Unequal Protection: The Rise of Corporate Dominance and the Theft of Human Rights. Rodale Books, 2004. (Information on p. 37)