Earlier quoted context omitted.
On some level, income inequality is intrinsically problematic even if you don't care about social issues at all, or don't think it's a zero sum game. Rich people have higher savings ratios than poor people. As a larger amount of income goes to those who have more than enough money than enough already, the average savings ratio increases. This is a drag on aggregate demand that hurts the economy. Supply side economist…
This is pretty much the situation we're in right now, where there is no shortage of capital, but rather a shortage of possibilities for profitable investments because consumers have become more careful with their spending. This is simply not true - personal consumption is at an all time high. It is even higher now than it was before our recently ended recession. http://research.stlouisfed.org/fred2/series/PCEC96 http…
As is so often the case, it comes down to how you interpret it and put it into relation to other things going on in the economy.
So real consumption is slightly above the previous peak. Now if productivity has increased in the three years that consumption had this "U" shape, it means the same amount of consumption goods and services can now be produced using less labour. This means that even though GDP may have returned to its previous peak level, this level of GDP is now accompanied by higher unemployment - unless new jobs have been created by something else.
A typical candidate for such job creation would be investment. However, given that consumption has only barely increased over the previous peak, there is currently little need for companies to make investments to satisfy consumption demand.
So I admit to not looking up the latest numbers before making my post, then I would have rephrased my statement. What's clear is that consumption hasn't returned to the previous trend (and probably won't), and that's a problem for the recovery (especially compared to the recovery from the 2000 recession, for example, where consumption did not deviate from the trend as the graph you linked to shows).