The majority of these Grade 3 or higher adverse events were chemotherapy-related and accounted for the difference between the 2 arms of the study.

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It's like the difference between reading books for the sake of reading and reading books just to get a good grade.

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Mercedes recommends 91-octane fuel, but the per-gallon difference of 15 to 20 cents seems a high price to pay for a grade that is only two octane levels higher than regular.

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The rest of the price difference is accounted for by the psychological impact of a higher price on a typical British buyer who would mistake nought-grade sandpaper for luxury as long as it were priced high enough or offered in a variety of colours.

ECONOMIST: Letters