Perhaps you don't need telling that self-help books, the modern-day apotheosis of the quest for happiness, are among the things that fail to make us … - Oliver Burkeman

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Perhaps you don't need telling that self-help books, the modern-day apotheosis of the quest for happiness, are among the things that fail to make us happy. But, for the record, research strongly suggests that they rarely much help. This is why, among themselves, some self-help publishers refer to the 'eighteen-month rule', which states that the person most likely to purchase any given self-help book is someone who, within the previous eighteen months, purchased a self-help book – one that evidently didn't solve all their problems.