This "first representative sample of planet earth," the authors wrote, "was used to explore the reasons why 'happiness' is associated with higher income."

这项“地球人的首个代表性样本”，作者写道，“被用于探寻为什么‘幸福’与高收入相关的原因。”

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Early in the 21st century, more than 20 of this assembly's members, home to half the earth's population, will lift themselves from the ranks of low-income nations.

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The reason is that income acts as an anchor limiting the price homeowners are able to pay, and has always pulled prices back to earth in every instance.

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