Costco Wholesale (NASDAQ: COST) shares have risen 24% so far this year (as of Aug. 14), outpacing the 16% gain by the S&P 500. That might indicate that investors view the company as somewhat of a safe haven during an uncertain economic time.

If you zoom out over the past five years, however, you'll see that the retail stock's 157% rise crushes the broader market. Costco has long been a winning investment, and I'm confident the business will continue to thrive for the foreseeable future. 

So, if I was forced to pick just one stock to buy, I think it would be Costco. Here's why. 

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Source Fool.com