India, one of the world's fastest-growing mobile-phone markets, is an obvious place to try all this out.

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However, if we break it down to a simpler level, it becomes more obvious (as I try to accomplish in my new book: How an Economy Grows and Why it Crashes ).

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Still, we can try to correlate vitamin D levels with obvious deficiency diseases such as rickets, but the environmental studies that look at other possible effects are problematic.

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So the obvious way to find out whether a number is prime is to try dividing it by all numbers which are smaller than its square root.

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Now, the obvious concern here is that it would also be in the interest of all bankers to try to correlate the default probabilities of their credit instruments so that they all default together and thus trigger the guarantee.

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Or try buying yam and telling the seller you want a particular type when it is obvious to her you cannot tell the difference between the species.

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Market timing is for the birds, so while you constantly try to call the twists and turns, you only ever change your position if something obvious and awful appears on the horizon such as the credit crunch.

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At the same time, unless there is an obvious replacement (like for the Democrats in 2008), we would see a host of other candidates try to jump in.

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