Emerging headphones purveyor 50 Cent studied a predecessor closely before pressing play on his own venture. When Beats by Dre headphones debuted in 2008, the size of the $100-plus headphone market was a faint $92 million. Four years later, the good doctor's b-emblazoned earpieces have achieved near ubiquity, and the $100-plus segment has been cranked up to $512 million.
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