No one else can . John Brownlee : Unveiling of a new MacBook is another sign of Apple 's competitive advantage . He says Apple does more than innovate ; it controls supply chain and freezes out competitors . Comment: Brownlee : Apple has a virtual `` time machine '' with which it 's able to stay years ahead .
John Brownlee : Unveiling of a new MacBook is another sign of Apple 's competitive advantage . He says Apple does more than innovate ; it controls supply chain and freezes out competitors . Comment: Brownlee : Apple has a virtual `` time machine '' with which it 's able to stay years ahead .