This is due to the previous trend of American youth carrying large boombox on their shoulders . The first week sales number in America was recorded 16 billion units (Bartlett , 2001 .3 .2 Technical and Price Competition Beside marketing aspects , many considered that the trend toward portable audio players is also influenced by the technical considerations . Consumers prefer gadgets with more functions and features . The rise of the portable audio players mentioned previously was also the result of higher capacity storage...











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