A reassessment of the relationship between GDP and life satisfaction.

PLoS One · 2013 · PMC3842267 · PMID 24312179

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highly significantno p-value reported

Both the linear and quadratic coefficients of the quadratic interpolations are highly significant and consistent with a peak internal to the regional GDP intervals.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.