General Motors Shares Plunge 6% Despite $20 Billion Buyback Announcement And Earnings Beat

General Motors Shares Plunge 6% Despite $20 Billion Buyback Announcement And Earnings Beat General Motors shares are plunging more than 6% in premarket trading Tuesday, despite the automaker announcing a massive new $20 billion share repurchase program and reporting quarterly earnings that came in ahead of Wall Street expectations, according to Bloomberg News.  The selling comes as GM continues to grapple with a weakening U.S. auto market, where higher financing costs and pressure on household budgets have made it increasingly difficult to sell lower-priced vehicles. Demand for the company's more expensive...