Costco's (NASDAQ: COST) revenue and earnings figures for its fiscal 2023 third quarter (ended May 7) might have disappointed Wall Street analysts, but this is still a great business. It has a loyal customer base and a strong economic moat. And shares have made for a wonderful investment, rising 148% over the past five years. 

You might want to add Costco to your portfolio right now, even though it has underperformed the S&P 500 over the last 12 months. But before you buy, you must deepen your understanding of the company. 

Here are three things the smartest investors know about this top retail stock.  

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Source Fool.com