Lululemon stock

By now we're all accustomed to hearing about the "two-speed economy," in which the wealthy flourish and the less affluent fall farther and farther behind. The widening gap between rich and poor has not been lost on the stock market: The valuations of luxury goods companies are much higher than those of lower-end firms.

Yoga and fitness apparel specialist lululemon athletica has earned the awe of stock watchers and customers alike. While the general market has gained a respectable 5% in 2011, lululemon is up more than 70%. Looking five to 10 years down the road, this could become one of the world's great athletic brands.

Shares in Lululemon Athletica rallied sharply Friday after the maker of yoga-inspired athletic apparel reported better-than-expected second-quarter earnings and raised its full-year outlook.