That statistic is compiled by the census bureau, and last I checked, unemployed people are part of the census and likely part of the statistic, especially since

That statistic is compiled by the census bureau, and last I checked, unemployed people are part of the census and likely part of the statistic, especially since it can indicate when one person has all the income. What I find odd is the article mentions 0.0 as the 'one person has all the income', where the wikipedia article on the Gini coefficient says 'A Gini coefficient of one (or 100%) expresses maximal inequality among values (for example where only one person has all the income).'