There's no doubt that Costco (NASDAQ: COST) has been a fantastic stock to own historically. A $170,000 investment 10 years ago would be worth $1 million today, translating to a tremendous return of 488% (as of Jan. 15). This crushes the gain of the broader S&P 500 index.

Can this top retail stock be a millionaire maker going forward? Here's what investors need to know about Costco's investment potential as we look ahead.

What makes this enterprise truly special is how much the business focuses on its customers and their needs. The company sells high-quality merchandise at some of the lowest prices around, in what many consider a superior shopping experience. The typical markup, as measured by Costco's gross margin of 11%, is far lower than other big-box retailers.

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Source Fool.com