Pali Research media analyst Rich Greenfield opined last week that Viacom stock, down 70% this year on advertising fears and the whims of its mercurial chairman Sumner Redstone, should be trading higher, even in the middle of one of the worst recessions in recent memory.img src="http://feeds.feedburner.com/~r/MultichannelBreakingNews/~4/469318232" height="1" width="1"/