Leigh Middleton is the CEO and Co-Founder_Six3. A lot has been written about digital marketplaces – virtual spaces in which a market operates – and, similarly, about niches – narrow target markets. However, the two are rarely contemplated together. Niche marketplaces have already proven to be a successful model for the likes of Airbnb, Etsy, Hotel Tonight, Uber, and Yplan by offering a focused user experience that is synergetic with the delineated audience requirements. But how do you keep this audience engaged and returning while building out both sides of the marketplace simultaneously? A niche marketplace with a two-sided interest...

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