第二种是“现代社会”，覆盖了大多数的中等收入水平国家。
The next is "modern society", which covers the majority of middle-income countries.
包括高管和运动明星收入的平均工资水平的增长速度比中等收入水平快。
Mean wages, which include the earnings of chief executives and sports stars, have risen much faster than the median.
对于税前收入较低的家庭，这意味着更高的减税比率，这对中等收入水平的家庭帮助尤大。
This means a larger percentage tax reduction for families with smaller taxable incomes, and specifically helps families in the middle income levels.
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