Walgreens Boots Alliance (NASDAQ: WBA) is a top pharmacy retailer. Customers can shop there, pick up prescriptions -- and soon will also be able to see a doctor, with the company investing billions to launch primary-care clinics at its stores. 

Is this a recipe for success, and can Walgreens be an investment that makes you a millionaire? Or is this struggling stock likely to fall lower in the years ahead?

One of the reasons it might be difficult to be bullish on Walgreens' future is that the business is an underperformer. Its profit margins aren't all that great and normally produce just a few percentage points of growth. And in recent years, the top line has been fairly stagnant:

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Source Fool.com