SHANGHAI (Reuters) - Apple Inc has more retail stores in Pennsylvania than in all of China - where it earns a fifth of its revenue - and a slow pace of expansion may cost the firm more than just sales. Apple's six stores in Greater China are routinely packed, and customers often wait in long lines for iPhone repairs. Scalpers are known to camp out to be first in line for new products, which they then re-sell for a tidy profit. ...

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