John Brownlee : Unveiling of a new MacBook is another sign of Apple 's competitive advantage . Apple announces high-res laptops . He says Apple does more than innovate ; it controls supply chain and drives out competitors . Apple 's products can then be sold at extraordinarily high profit margins , he says . Brownlee : Apple has a virtual ` ` ' 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 drives out competitors . Apple 's products can then be sold at extraordinarily high profit margins , he says . Brownlee : Apple has a virtual ` ` ' machine '' with which it 's able to stay years ahead .