Recently, for a consulting client, I did a rough comparison between their customer base (which tended to be young, information-intensive companies) and a benchmark comparison set from the mainstream economy.

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The comparison makes the professors' set of figures look wildly optimistic, or else the Scottish government's calculations look underwhelming.

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Instead Argos, Currys and the now defunct Comet group agreed to set up a price comparison website where consumers can easily compare warranties.

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