Buying shares of highly reliable businesses that generate fat cash flows year after year is a time-tested strategy of some of the world's most successful investors, including the likes of Warren Buffett. And while the Oracle of Omaha doesn't own any shares of the national pharmacy chain Walgreens Boots Alliance (NASDAQ: WBA), many investors do, and often with mixed results. 

If you're considering making a purchase, it makes sense to look back at the pharmacy's long-term performance to get a feeling for what role it might fill in your portfolio. Let's take a look at this company's business model and calculate how much you would have made if you invested $5,000 in it 10 years ago.

Not every stock is right for every investor, and if you decided to buy Walgreens around a decade ago, there's a solid chance that you're now feeling as though it wasn't the right move for you. 

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Source Fool.com