In the North, the Revenue Act of 1861 marked the first instance of a federal income tax (of three percent), but the tax affected only a very small high-income group.

在北方，1861年《税法》是联邦第一次开征所得税(税率为3%)，但这项税收仅影响很小一部分高收入人群。

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Through empirical analysis, we founded that from 1985 to 2005, the growth of income of each group was notable, but the growth of income in low-income group was slower than that in high-income group;

通过实证分析，本文认为1985-2005年，我国城镇各组居民收入都有了很大的提高，但是低收入者的增长率要小于高收入者；

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The earlier group enjoyed a high degree of mobility but the later one was less fortunate, suggesting that movement between income groups is slowing down.

前一组人有很高的流动性，而后一组人则没有那么幸运。这说明，不伺收人人群之间的流动正在减慢。

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Any realistic, practical plan to limit tax expenditure cuts to a high-income group would require a phase-in of the cuts or other accommodations, which would add to marginal tax rates, reduce the potential revenue gain, and make the resulting tax change more regressive.

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The corresponding rate in men in the same group is between one to two times greater in men of the same age in high-income countries.

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