Apple's (AAPL) fall from grace has certainly gotten it's fair share of coverage, and you've probably heard a countless number of reasons for why it has experienced such a big drop. The bottom line is that it's all about earnings (pun intended), and the chart below highlights this pretty clearly. In the chart, we compare Apple's stock price movement since the start of 2012 to the consensus analyst estimate for its upcoming quarterly earnings report. As you can see, the stock price has tracked earnings estimates very closely. Last September when AAPL was hitting all-time highs, the company was expected to earn nearly $13.50 per share this quarter. As of today, it's only expected to earn $10 per share this quarter.