General Motors (GM) isn't giving up on its Opel brand, despite the European carmaker's drag on the company. CEO Dan Akerson told 5,000 members of Opel's staff in Germany he won't "simply close up shop and leave" despite pressure from investors to divest the unit. Morgan Stanley estimates Opel will report an average $1 billion in operating losses annually through 2021, according to a Reuters story. GM shares were down 1% in midday trading Thursday.