For example, Hyundai has risen to the top spot in the Brand Keys Customer Loyalty Engagement Index, heading all other automotive brands and placing sixth among a total of about 600 brands across 83 verticals.

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Wall Street has lost more than a fifth of its value in the past 10 trading days and is heading for one of its biggest weekly falls since the Dow Jones index was created 112 years ago.

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Heading the list of the unhappiest jobs is security officer, with an index score of 3.51 out of 5.

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