more expensive to run than mature ones.
Analysts then pulled back sharply on their estimates. Their average forecast is now $13.45 per share, according to FactSet.
In terms of sales, Apple said it expects to report about $52 billion in revenue, and analysts have wavered only slightly above that figure - they now expect sales of $54.9 billion.
While Apple's future prospects are in doubt, the company's supporters have one strong argument in their favor: the stock is cheap compared to current earnings, and even if the iPhone's sales growth slows, Apple will continue to generate plenty of revenue. The stock trades at 11 times the past 12 months of earnings, compared with 15 for Microsoft Corp. and 22 for Google Inc. Those figures don't take into account Apple's enormous cash pile -$121 billion- which boosts its value even further.
Despite its size, Apple's stock is no stranger to corrections. In 2008, in the midst of recession, Apple's stock fell by more than half, to under $100 per share. At the time, the iPhone was a year old and hadn't revealed its full potential.
It was only in early 2012 that its market capitalization decisively outgrew that of Exxon Mobil Corp., previously the world's most valuable company.
A smaller correction last year, also prompted by speculation about the future of the iPhone, took the stock down 16 percent before it rebounded.
"We believe investors that can look through this noise will be rewarded in 2013,'' said Brian White at Topeka Capital Markets. "The negative sentiment around the stock has reached epic levels that we haven't seen in recent memory and yet we believe the product portfolio has never been stronger.''