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spaceguy said:

I... don't see the point of this graph. It shows that all income groups have seen an increase in wealth? If one group was getting poorer while others were getting richer... I'd see the controversy, but here, I don't.

You also need to take into account income mobility. Most people who were in Bottom-Second in 1980, will be in Fourth-Top in 2007. So, actually, the individual (or household income) for those people has increased dramatically.