The error is that with content costs constantly rising, monetization of mobile usage (now over 70% of usage) has to keep rising.

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Such a trial-and-error approach is expensive and costs lives, because several diseases, such as Alzheimer's, are best treated as soon as they are diagnosed.

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But Browne's deepwater push carries big risks, ranging from steep upfront costs to devastating human error and corrupt foreign governments.

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Transport, chlorine, ore and capital were hugely important costs, about more or less a rounding error compared to those.

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Unlike costs, capital expenses are written off against profits over time, so the error by WorldCom boosted its reported cashflow and profits.

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Moreover, transportation fuel costs are high around the world at a time when there is little margin for error in the economy.

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