There's other reasons for the drop outside of company performance. This is all based on stock prices and nothing fundamentally has changed. Apple is cheap in comparison to other related companies. Especially with $120B+ in the bank - expected to be $150B in a quarter or so.
From a comment on VentureBeat that seems very plausible for a drop:
The reason why Apple sold off today is that clearing firms are raising their margin requirements for positions due to fears of being too heavily concentrated in the company. One firm, COR Clearing, raised its margin requirement to 60% from 30%. Doubts regarding their current and upcoming product lines have already been priced in for weeks; this price movement seen today was the result of advanced algorithms scanning the news and executing trades, and investors who traded on margin selling shares to meet the new requirements, all of which put heavy downward pressure on the stock.
From a comment on VentureBeat that seems very plausible for a drop:
The reason why Apple sold off today is that clearing firms are raising their margin requirements for positions due to fears of being too heavily concentrated in the company. One firm, COR Clearing, raised its margin requirement to 60% from 30%. Doubts regarding their current and upcoming product lines have already been priced in for weeks; this price movement seen today was the result of advanced algorithms scanning the news and executing trades, and investors who traded on margin selling shares to meet the new requirements, all of which put heavy downward pressure on the stock.
http://venturebeat.com/2012/12/05/aapl-sheds-a-yahoo-yelp-an...