It's natural to fear that you've missed out on most of a stock's gains if the price has run up significantly. However, it's never too late to buy a company that still has good earnings potential.

Costco Wholesale (NASDAQ: COST) has performed well, and its share price has had a strong run-up over the years, including a 40% gain over just the past year alone. Are the shares still a buying opportunity?

That takes work to uncover. It's time to dive into the company's business to see whether its prospects remain bright.

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Source Fool.com