Mr. Marchionne held up hydrogen fuel-cell propulsion as an example of faddish technology that proved impractical.

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Red Bull is the drink of choice for this hip, nervous, faddish bunch of characters.

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Similarly, ensuring that firms can venture into new businesses has proved a recipe for faddish, costly mistakes.

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Even within that category, buyers are subjective, faddish and emotional, which as Rabin pointed out, can massively inflate prices.

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The market is too cyclical, with prices tethered to faddish taste.

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After all, it was California that 11 years ago threw out the tried-and-true reading method known as phonics for a new, faddish method called whole language.

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On the other hand, the printed copy, edited and republished once in a while, serves as a barrier to faddish words, keeping the canon relatively clean.

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Sounds faddish, but this fad has other fans.

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Absent even one of these fundamentals, and the place eventually languishes. (This is why, Kotkin says, superficial efforts to create faddish commercial attractions without an underlying organic community often disappoint.) So, making the trains run on time is but one basic requirement.

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