Apple's operational mastery and their cornering of the NAND flash market in particular is a big part of this.
Tim Cook has been running operations at Apple for a decade now. Here's a 2006 story about Apple's number two:
http://online.wsj.com/public/article/SB116096027141893457-aw...
Apple's operational mastery and their cornering of the NAND flash market in particular is a big part of this.