摘自:The Bear Case for Apple
10 Concerns
-  Quality vs. price: Apple is now selling less or equal for more money. The company used to sell a better product for more money, which is a  great strategy. Its products were simply market-defining, and  competitors were not close. Recently, however, things have changed, and  competitors have caught up. Now Apple is selling an equal to worse  product than the competition for more money (both phones and tablets).  That strategy cannot work forever. This is the biggest issue.
-  Delivering a more complicated product: Products are also getting more complex and Microsoft-like. Apple's challenge is to deliver ever more complicated products (with a  lot of new components) in sufficient quantities. See most recent Foxconn issue.  Previously, we would never have seen such a story because there were  never issues and nobody would dare voice them, especially not an avowed  Apple zealot like the author of this interesting article.
-  The Oracle of Cupertino: Steve Jobs is no longer around to convince consumers that his products are magical. There is no longer a single visionary voice, especially with the vision  of Steve Jobs. There are stories floating around about internal  disagreements and power struggles given the unique void created by the  loss of a single dominant figure in an unusual corporate structure that  he controlled.
-  Increasing product homogeneity: Apple no longer has a huge ecosystem advantage. Most if not all the apps that consumers care about are available on Android and Microsoft MSFT , which can also run Office apps such as Excel that Apple  doesn't. The first-mover advantage might be lessened or lost if Apple  continues to try to do everything on a proprietary basis -- for  instance, maps (and who wants a smartphone with bad maps?).
-  Economic headwinds: Some of the markets served by Apple are  saturated, and in a worldwide economy facing strong headwinds, consumers  may balk at a product that can be purchased at much lower prices from  competitors. Until last quarter, Apple never missed consensus  expectations during a product transition. There is more to last  quarter's miss than transition.
-  Poor economic proposition for Apple's partners: Apple's carrier partners do not like the economics they give to Apple. Apple's partners have shown that they can and will shift to the good alternatives that consumers seem to like (e.g., Samsung Galaxy).
-  Roadblocks to new initiatives: Potential business partners in general do not like or trust Apple relative to other initiatives. The music industry and AT&T have not had great experiences with  Apple, and the company might find it hard to sign deals for new  initiatives.
-  Product cannibalization: The iPad mini may cannibalize the higher-margin iPad -- or just be a neutral at best. 
-  Growing size mandates delivery of more product blockbusters: An  investor better believe in a huge new blockbuster product next year. TV is complex due to relationships with cable companies, set-top box  manufacturers and channel guide programmers. Google may one up Apple in  the space, as it owns Motorola's set-top box division and has Google  Voice already. If it comes to integrating more complex solution for TVs  with content, cable companies and other media partners have learned not  to trust Apple given the poor outcomes other Apple partners have had  (e.g., music industry, AT&T, etc.).
-  Valuation: Apple's stock is cheap on a P/E basis but arguably  very expensive on price/sales (4.4x) and total absolute market  capitalization basis ($625 billion).