How do you compete and how do you build a barrier around your business in the age of digitization? In this chapter of our new set of Digital Edge interviews, McKinsey's Simon London talks to eBay Marketplaces President Devin Wenig about the role of data in maintaining and gaining competitive advantage. Join the digital conversation using the hashtag #McKDigital on Twitter and Facebook—and learn what digital leaders are talking about on our Digital Trends board, bit.ly/McKDigiInfo.