The implication of the above is that any average or mean of incomes in the top 20% will always be much higher than the median of incomes in the top 20%, which is defined as the income level with half of those in this fifth above, and half below.

FORBES: More On The Certain Equality Of Reaganomics

As a result, in the 20 years to 1999 some 5m immigrant households were added to those defined as below the poverty level.

ECONOMIST: The economy

First, virtually no poor U.S. citizens (defined according to the poverty level) are without health insurance.

FORBES: Krugman's Sick Numbers