Learn to know what you buy. Check out Key Statistics on Quote page of Yahoo for Ford, or any other investment website. A stock is worth what people are willing to gamble, not the book value, but it shows how far reality twists from what would seem common sense. Ford's possible problem is like a family who has maxed out on credit. But Ford can keep selling shares of stock to raise money right?
What? Ford has paid down 2/3 of its debt since 2003. I would not call 66% a small number. Ford has positive cash flow of about $4 per share and working capital of about $47 billion. There is no need to sell stock but is possible they will buy back stock. Book value is a meaningless number for many reasons. For example they buy a piece of equipment that lasts for 20 years but depreciate it over 5 years. After 5 years the book value is 0 but it may be worth as much or more than the purchase price.