Apple is now one of the biggest investors in research and development, and critics are wondering wha

Apple has been massively ramping up its spending on research and development in recent years. It now spends nearly $15 billion a year, giving it one of the biggest corporate R&D budgets in the world. Analysts and investors have begun to question that spending, because the company seems to have gotten little payoff from it so far. Apple is still heavily dependent on the iPhone and its new products haven't come close to making up for shortfalls in its phone sales. Analysts attribute the...