The effects of Big Business on assets, sales and profit distribution are clear. In the USA, in 1985, there were 14,600 commercial banks. The 50 largest owned 45.7 of all assets, the 100 largest held 57.4%. In 1984 there were 272,037 active corporations in the manufacturing sector, 710 of them (one-fourth of 1 percent) held 80.2 percent of total assets. In the service sector (usually held to be the home of small business), 95 firms of the total of 899,369 owned 28 percent of the sector's assets. In 1986 in agriculture, 29,000 large farms (only 1.3% of all farms) accounted for one-third of total farm sales and 46% of farm profits. In 1987, the top 50 firms accounted for 54.4% of the total sales of the Fortune 500 largest industrial companies. [Richard B. Du Boff, Accumulation and Power, p. 171]

The process of market domination is reflected by the increasing market share of the big companies. In Britain, the top 100 manufacturing companies saw their market share rise from 16% in 1909, to 27% in 1949, to 32% in 1958 and to 42% by 1975. In terms of net assets, the top 100 industrial and commercial companies saw their share of net assets rise from 47% in 1948 to 64% in 1968 to 80% in 1976 [R.C.O. Matthews (ed.), Economy and Democracy, p. 239]. Looking wider afield, we find that in 1995 about 50 firms produce about 15 percent of the manufactured goods in the industrialised world. There are about 150 firms in the world-wide motor vehicle industry. But the two largest firms, General Motors and Ford, together produce almost one-third of all vehicles. The five largest firms produce half of all output and the ten largest firms produce three-quarters. Four appliance firms manufacture 98 percent of the washing machines made in the United States. In the U. S. meatpacking industry, four firms account for over 85 percent of the output of beef, while the other 1,245 firms have less than 15 percent of the market.

While the concentration of economic power is most apparent in the manufacturing sector, it is not limited to manufacturing. We are seeing increasing concentration in the service sector - airlines, fast-food chains and the entertainment industry are just a few examples.

The other effect of Big Business is that large companies tend to become more diversified as the concentration levels in individual industries increase. This is because as a given market becomes dominated by larger companies, these companies expand into other markets (using their larger resources to do so) in order to strengthen their position in the economy and reduce risks. This can be seen in the rise of "subsidiaries" of parent companies in many different markets, with some products apparently competing against each other actually owned by the same company!

Tobacco companies are masters of this diversification strategy; most people support their toxic industry without even knowing it! Don't believe it? Well, if you ate any Jell-O products, drank Kool-Aid, used Log Cabin syrup, munched Minute Rice, quaffed Miller beer, gobbled Oreos, smeared Velveeta on Ritz crackers, and washed it all down with Maxwell House coffee, you supported the tobacco industry, all without taking a puff on a cigarette!

Ironically, the reason why the economy becomes dominated by Big Business has to do with the nature of competition itself. In order to survive (by maximising profits) in a competitive market, firms have to invest in capital, advertising, and so on. This survival process results in barriers to potential competitors being created, which results in more and more markets being dominated by a few big firms. This oligopolisation process becomes self-supporting as oligopolies (due to their size) have access to more resources than smaller firms. Thus the dynamic of competitive capitalism is to negate itself in the form of oligopoly.