Costco (NASDAQ: COST) has been one of the market's most resilient retail stocks since its public debut in 1985. The warehouse retailer endured four major U.S. recessions while turning a $1,000 investment in its IPO into more than $436,600.

That was an incredible run, but cautious investors might be hesitant to buy Costco today because it looks a bit pricey at 46 times forward earnings. So today, I'll discuss four reasons it deserves that premium valuation -- and why it could head higher.

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Source Fool.com