Some of the most boring businesses can turn out to be fantastic investment candidates. This is exactly the case with Costco (NASDAQ: COST).

Including dividends, this top retail stock has produced a total return of 756% in the past decade, which means that a $10,000 initial investment would be worth nearly $86,000 today (as of May 24). This is a much better gain than either the S 500 or the Nasdaq Composite index.

By taking a closer look at Costco's business and stock, investors can figure out if they want to add this winner to their portfolios.

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Source Fool.com