Walmart is using the oldest trick in the book to boost its stock price (WMT)

Walmart is sweetening the pot for shareholders before its annual meeting, using the oldest trick in the book. The retailer on Tuesday morning announced that it had authorized up to $20 billion in stock buybacks over the next two years. That's a massive amount of capital to be allocated for repurchases, which are frequently used by companies to boost shares during times devoid of other positive catalysts. Not that Walmart will need to fall back on that tactic quite yet. In Tuesday's...