In terms of income, the gap between rich and middle class is growing, but in terms of happiness it is relatively low by broader historical standards.

（ ——牛！作者思想境界太高了，译者）从收入来说，富人和中层阶级的差距是在扩大，但是从快乐的角度来说它比历史上的标准相对要低。

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The treatment gap was over 75% in low-income countries and over 50% in most lower middle - and upper middle-income countries, while many high-income countries had gaps of less than 10%.

低收入国家存在75%以上的治疗缺口，大多数中低收入国家存在50%以上，而很多高收入国家的治疗缺口不到10%。

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The society lacking the development of middle group must be a society in which there exist wide income gap and polarization and must be a society…

中产阶层缺乏的社会必定是社会分化不完整或是贫富过分分化的社会，必定是分配正义缺失的社会。

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Some cities, like Shanghai, have gotten so rich, so fast, that the millionaires are becoming jealous of the billionaires and the middle class are in the middle of an ever worsening income gap between the haves and the have nots.

FORBES: Shanghai Times Op-Ed Links Govt Corruption to Income Inequality

The presence in the emerging markets will help Gap tap into the increasing disposable income of the growing middle class in these countries, lending a significant upside to its revenues.

FORBES: Nothing That A Hundred Men Or More Could Ever Do To Keep Gap Out Of Africa Or Under $30