At the forefront of the artificial intelligence (AI) revolution, it's not just tech and internet stocks that have been winning for shareholders. Even companies in old, boring industries can post outstanding gains.

Just look at Costco (NASDAQ: COST). This magnificent retail stock has crushed it for shareholders in the past three years, soaring 98%, a return that includes dividends. Costco is undoubtedly a wonderful company, but you should avoid it like the plague.

Here's why.

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Source Fool.com