Here's a not-so-dirty little secret: Companies that do right by their employees, their local communities, their customers, and the world at large tend to do very well for their investors as well. It's little wonder that a "pro-social" investment portfolio can beat the market. And it's no surprise that fast-casual restaurant Chipotle (NYSE:CMG) is a natural fit for the socially responsible investor.

Alyce Lomax owns shares of Chipotle Mexican Grill. The Motley Fool recommends and owns shares of Chipotle Mexican Grill. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.