This trick can be employed only when the current fair value of the asset falls below the book value of the asset.

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Axa Rosenberg's model involves thousands of multivariate regression calculations, but it all boils down to the same thing that old-fashioned value investors are looking for: an estimate of fair value, which is then compared with current stock prices.

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Again, at the current trading levels for Monsanto we are getting the Seed and Genomics business at fair value and the rest of Monsanto for almost nothing.

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Though property prices there are not as frothy as in some countries (even the normally staid governor of the Bank of England was moved this week to warn about Britain's giddy house prices), at current interest rates, house prices would need to fall 10% or so to be anything appoaching fair value.

ECONOMIST: Buttonwood

Our index suggests that a fair-value rate would be 3.54 yuan to the dollar, compared with the current rate of 6.78.

ECONOMIST: Burgernomics