Think small. It's one of the best ideas for investors seeking to reap returns that trounce the overall market.

Three Motley Fool contributors identified small-cap stocks that they think could especially become big-time winners. Here's why they chose Bluebird Bio (NASDAQ: BLUE), Travere Therapeutics (NASDAQ: TVTX), and Viking Therapeutics (NASDAQ: VKTX). 

Prosper Junior Bakiny (Bluebird Bio): Bluebird Bio is a gene-editing specialist currently sporting a market cap of $402 million, putting it squarely in small-cap territory. The biotech has encountered a series of clinical and regulatory setbacks over the past three years, leading to it losing nearly 90% of its value. Yet, there could be some hope for the company. 

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Source Fool.com