I'm not saying that - but I'm saying no one sector is representative of an economy, and you actually have to look at each sector before making any conclusions.
Cell phones have 4 national players, as well as numerous regional (alltel, us cellular are examples) - comparing that to the oil industry is ridiculous. I think you fail to understand the costs associated with cell phones - especially given the recent influx in internet capable phones. Basic I/O tells us that for firms, profit maximization occurs when their marginal revenue is equal to their marginal cost. There is not a single cell phone company out there making profits any where near that point.
As for banking and housing - I'm not sure what you're talking about, nor how you can compare those things to cell phones or oil with a straight face. There is a great peter schiff lecture that discusses the housing crisis - which had a number of contributing factors. You really need to be more specific.. you can't just say "LOOK AT HOUSES AND BANKS!" and expect that to prove any point. What exactly about housing and banking are you talking about? Issues in both industries have specific and often interlinked causes.
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