Apple Inc. has tumbled 20 percent since its Sept. 21 intraday high of $705.07, entering a bear market as the company faces accelerating competition and struggles to make enough iPhones to meet demand. The largest company by market value hasn’t been able to keep up with demand for the latest version of the iPhone; iPhones account for about two-thirds of its profit. Samsung and Amazon.com are also challenging Apple’s dominance in the tablet computer market.
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