For the past half-century, those lucky enough to have been born in a rich country have had every prospect of growing richer. On average, incomes in Britain, America and Japan, adjusted for inflation, have easily doubled over that time. On top of this come the benefits of longer lives of better quality, thanks to advances in medicine and to a plethora of consumer goodies making living easier and more enjoyable. You might, even, expect folk to be a great deal happier today than in the 1950s.
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