The market has risen sharply so far in 2013, with the S&P 500 (SNPINDEX:^GSPC) up more than 25% since January. But there's one thing that truly sets this market apart from other high-return years in the past.

In the following video, Dan Caplinger, The Motley Fool's director of investment planning, examines how broad the stock market's rally is. As of late November, 458 of the S&P's 500 stocks were up, something that hasn't happened since 2003, according to figures from S&P Dow Jones Indices. Dan notes that that's a big departure from the late 1990s, when tech stocks soared but many old-economy stocks lagged behind.

Dan notes that by contrast, in today's market, most of the losing stocks are due to company- or industry-specific problems. He discusses why Mosaic (NYSE:MOS), Cliffs Natural Resources (NYSE:CLF), and Exelon (NYSE:EXC) have struggled in 2013, and concludes with some views on whether the overall market's positive performance is likely to continue.