http://www.alternet.org/economy/152695/banking_has_become_an_oligopoly_instead_of_a_competitive_business_--_and_that%27s_really_bad_news_for_us_99/ Some folks have responded to Bank of America's announcement of a new $5 per month fee on debit cards with a glib, "If you don't like it, just pick another bank. It's a free market, baby!" They say that competition will punish BofA for its evil ways.
Sounds easy enough. Except for one small problem.
Banking is not really a competitive industry. In reality, it's more like an oligopoly -- a scenario in which an industry is controlled by a small number of firms. An oligopoly is a lot like a monopoly, where one firm controls the whole show. Only in an oligopoly, you have two or more firms calling the shots, and they love to do things contrary to the notion of a free market, like, say, colluding to raise prices. There are a few common signs that tell you when competition has left the building in a given industry. See if any of these look familiar.
Concentration of Power
The last time big banks blew up the economy, causing the Great Depression, they got broken up. Tight regulation protected small banks, so they could get in on the action. But a massive trend of consolidation in the industry starting in the mid-'80s shrank the total number of banks in the United States as bigger banks gobbled up little ones. Result? The biggest banks control a larger and larger share of deposits.
More at the link --