These are what social scientists call quintiles.

这些就是社会科学家所说的五分位数。

About 20% of Americans, or the bottom quintile, fall into this group.

大约 20% 的美国人，即最底层的五分之一，属于这一群体。

For the bottom quintile, average household wealth levels are negative.

对于底层的五分之一，平均家庭财富水平为负。

The households in the top quintile earn about 50% of all the income in the United States.

收入最高的五分之一家庭的收入约占美国总收入的 50%。

Of those born in the bottom income quintile, 36% remain in the bottom quintile as adults.

在收入最低的五分之一出生的人中，有 36% 的人成年后仍处于收入最低的五分之一。

Well, the top quintile’s household income was about twice the median income.

嗯，最高五分之一的家庭收入大约是收入中位数的两倍。

Now, the simple fact that these quintiles have different incomes tells us that we don’t have a perfectly equal society.

现在，这些五分之一人群收入不同的简单事实告诉我们，我们没有一个完全平等的社会。

As of 2015, households in the US that make less than $22,800 a year are the bottom quintile of the income distribution.

截至 2015 年，年收入低于 22,800 美元的美国家庭处于收入分配的最低五分之一。

Only 10% of those born at the bottom end up in the top quintile as adults.

出生在底层的人中，只有 10% 的人成年后最终跻身顶层五分之一。

Wrong. The average net worth for those in the top quintile is 9 times that of the median – $630,000.

错误的。最高五分之一人群的平均净资产是中位数的 9 倍——630,000 美元。

So we’ve got an average net worth of about negative $6,000 for the bottom quintile and a median household wealth level of about $68,000.

因此，底层五分之一的平均净资产约为负 6,000 美元，家庭财富中位数约为 68,000 美元。

Since the start of the year, the median share price of the top 100 has risen by 11% for the lowest-scoring quintile it has not moved at all.

自今年年初以来，排名前 100 名的股价中位数上涨了 11%，而得分最低的五分之一则根本没有变动。

Researchers at the Brookings Institution, including Crash Course Sociology writer Joanna Venator, found that 30% of those born in the top quintile stay in the top quintile as adults.

布鲁金斯学会的研究人员， 包括速成班社会学作家乔安娜·维纳特 (Joanna Venator)，发现出生在前五分之一的人中有 30% 成年后仍保持在前五分之一。

White Americans see more upward mobility than Black Americans: half of Black Americans that are born at the bottom of the income distribution are still in the bottom quintile at age 40.

美国白人比美国黑人看到更多的向上流动性：出生在收入分配底部的美国黑人中有一半在 40 岁时仍处于底部五分之一。