The sometimes inexplicable world of Amazon performance metrics continues. The company reported fourth quarter sales on Thursday after the close of the market, with relatively modest growth — up 15 percent to $29.33 billion, below analysts’ expectations of $29.7 billion. But their meager net income of seven-tenths of one percent — $214 million, or 45 cents a share — was much better than the miniscule earnings Wall Street was prepared to expect (22 cents a share), and so the stock has risen about 10 percent (or $30 a share) after an hour of trading on Friday. But let’s focus on the data […]