Amazon's (NASDAQ: AMZN) efforts to reduce costs in the retail business, including optimizing inventory at its fulfillment centers, is starting to pay huge dividends on the bottom line. The business generated an impressive $50 billion in free cash flow over the trailing-12-month period, a massive turnaround from negative $3 billion in the same period a year ago.

Amazon's growing free cash flow is already paving the way for more aggressive capital investments in Amazon Web Services (AWS) -- the company's highly profitable cloud-services business. This could have positive implications on the stock's returns over the next several years.

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Source Fool.com