A better indicator of economic health is to look at changes in the individuals with highest net worth. In countries with government-granted monopolies, the list remains relatively constant year upon year. In more competitive countries, the list churns new wealth in with the old.
I do wish we could get over this "1% vs 99%" meme though. Incomes are mostly continuous as you go up the scale. The change in annual income / net worth of the bottom guy in "the 1%" and the top guy in the "the 99%" is immaterial.
If the article is warning us that we're on the brink of a Depression, mentioning the 1927 stats, I would like to see some sort of charts showing this 1% slice over time[1].
And for "the rest of us," it isn't the fault of "the 1%" that median incomes haven't matched productivity gains over the last 40 years[2]. This is where more scholarly work should be focused, in my opinion. Basically, it doesn't matter how much wealth the top earners have, as long as the median income is growing. The headline and article are simply engendering class warfare instead of examining the deeper causes of median income stagnation.
[1] http://en.wikipedia.org/wiki/File:2008_Top1percentUSA.png
[2] http://upload.wikimedia.org/wikipedia/commons/4/45/Productiv...