"Could Apple be worth $1 trillion? It’s conceivable. The $347 billion maker of iPhones and iPads became — if only briefly — the most valuable company in the United States when it overtook Exxon Mobil on Tuesday. Yet Apple’s sales have been surging 80 percent a year, and its profit faster. What’s more, it trades roughly in line with the growing stock market — and at less than half the price-to-earnings multiple it fetched in 2006, when revenue growth was much slower.."