Buy silver for short-term trade, advises the MACD watched by this technical analyst... IT'S TIME to buy silver again, writes Jeff Clark at Growth Stock Wire, part of Porter Stansberry's research group. We last bought the metal back in January at about $19.70 per ounce. We rode the rally all the way up to $22 before stopping out last month at $20.35. Overall, we earned about 3.4% in less than two months. And now that silver has pulled back to the price we bought it in January,