How tough is it to infuse a retail website with entirely new products every day? Very. But that's exactly what Zulily, an ecommerce site that sells unique retail brands primarily to women, did when it went live in 2010.

On this week's episode of "Office Hours," Spencer talks with Zulily founder and former CEO Darrell Cavens and Harvard Professor Jeffrey Rayport about Zulily's astonishing success and some granular lessons learned from a company that grew incredibly big incredibly fast.

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