Amazon reported fourth quarter sales after the close of the market on Tuesday, coming in at the low end of their own sales projections. That means that sales of $21.27 billion, up 22 percent, also fell $1 billion short of analysts’ expectations. The company did show some net income–but it was a slim $97 million or 21 cents per share, again short of investors’ expectations. (Net income is also much lower than the same quarter a year ago, when they earned $177 million.) But operating income rose–at $405 million, 55 percent better than a year ago, and better than the forecast […]