The price of a share is coorelated to the price that share could be sold for and/or the amount of dollars it earns in corporate payout. The market for various reasons buys in anticipation of a certain future value and/or earnings. If that value isn't being realized then the share price drops as share holders cut their losses (or lack of anticipated profits). In Apple's case the hugely anticipated value turned out to be flatter and thus the share price is simply correcting to that reality. It isn't really a negative.