Since most of the GDP "growth" of the last fifteen years consisted of pumped-up consumer goods spending financed by overseas borrowing, no one should be surprised to see this happen.
Investors and traders don't believe it -- they're staying away in droves, and all the volume that is driving the averages higher since last November, esp. since the March low, is coming from a short-list of stocks being played furiously by back-office black-box operations, many of them fully automated, at a few of the big investment banks, esp. Goldman Sachs. The market is a chimera, a charade.
And it still hasn't corrected properly, and both "it" and everyone watching, knows it.