FORTUNE -- One of the fears that sent Apple's (AAPL) stock price into a seven-month tailspin was concern that the company's enviable profit margins -- which had already taken a hit when it introduced a flurry of new products last fall -- could be hit again if it launches a...
How a low-cost iPhone raises, not lowers, Apple’s profit margins
Morgan Stanley's Katy Huberty has done the math.
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