Most investors are probably familiar with Costco Wholesale (NASDAQ: COST). With fiscal 2023 net sales of $238 billion, it's the world's third-biggest retailer, behind only and Amazon. It's a consumer favorite thanks to its low prices.

This top retail stock has also been an investor favorite, producing a total return of 215% in the past five years. That trounces both the S 500 and the Nasdaq Composite. I'm sure Costco shares are on your investing radar. But before you rush to add the stock to your shopping cart, here are three must-know facts.

Costco's massive sales base is the key to its ongoing success. In other words, its scale makes up its competitive advantage.

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Source Fool.com