* Market Cap is meaningless and the Ford example illustrates why. Ford has a D/E ratio of over 4. This means that four times as much of Ford is "owned" by bondholders than shareholders. So naturally, the stock is worth less - the real owners of Ford are the lenders. If you don't believe this, guess who ends up owning a company after bankruptcy? Yup, the bondholders - while shareholders are wiped out. So when people harp about "Market Cap" of such-and-such a stock, just plug your ears and tune it out. Market Cap is a meaningless number than only boobs on the financial shows toss around. It means nothing, whatsoever.
UPDATE: Not only is Ford seeing lower sales, GM is too, particularly with cars and even their trucks. Again, the press raises the canard of the "tech" sector cutting into sales, even as Tesla has hardly sold any cars, and no one has actually sold any self-driving cars to date. Rather, the reason is simple: Recession. Ford and Fiat-Chrysler are propping up truck sales with sales to fleets and steep discounts, cutting into GM's revenue. Car sales are down as gas is cheap and everyone wants a huge SUV or pickup truck - those who are still buying at this point, that is.
This will turn around in 2-4 years, of course!