Amazon (NASDAQ: AMZN) has given investors plenty to worry about lately. Its shares have plunged more than 40% year to date. The company's fourth-quarter guidance was much weaker than anticipated. Its e-commerce and cloud hosting customers are tightening their purse strings.

But those aren't really the biggest issues. Here's the single most concerning trend for Amazon.

What's the most important financial metric for a business? Some might say earnings. Others might think it's revenue. I'd argue, though, that the best answer is free cash flow.

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Source Fool.com