Do you happen to know why, according to that wikipedia page, "According to the U.S Census Bureau 'The per capita income for the overall population in 2008 was $26,964'", whereas according to the source of your charts (which suggest that citations should credit the Census Bureau!), it was $38,376? ( https://fred.stlouisfed.org/series/MAPAINUSA646N ). One of those is being seriously adjusted. I tend to suspect it's the Fed chart, which notes that its population base is those aged 15 years and over.

I'm still struggling to understand why you responded to my original comment in the first place. What point are you trying to make? The median income value tells you absolutely nothing about the relative numbers of people making incomes other than the median value.

Yes, later in the article it says that, too. Which still is inconsistent with your claim; both the median and the usual average, the mean (per capita), are reported, it is not the case that just the median is used and reported as the "average".