The Apple one doesn't really work, since the stores are primarily to sell their own products. Apple is an outlier when it comes to focus, though. But despite t

The Apple one doesn't really work, since the stores are primarily to sell their own products. Apple is an outlier when it comes to focus, though. But despite the fact that most of these companies do multiple things, it's clear where their core competitive advantage lies: Google is search, Amazon is online retail, Microsoft is Windows/Office, Yahoo is ?