The IDC article not only reinforces this point, but also indicates that the market share declines are much larger than had originally been believed.

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However, what I find equally interesting is that this research also indicates where hubris comes from: It comes from us!

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Not only does this suggest that very few traders are betting on additional downside for BTU, it also indicates that the shares have very little in the way of sideline cash to fuel future gains.

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This latest research, by Dr Angela Guillozet and colleagues at Northwestern University, indicates that these tangles also occur in people who do not have Alzheimer's.

BBC: Clue to old age memory loss

This indicates that the factors that restrain dynamism in non-oil segments of the Angolan economy, also act as constraints on the very survival of the urban poor.

CNN: Opinion: Is oil-rich Angola a development success?