In 2006 a major European brewing company we’ll call BeerCo was faced with falling bar and pub sales and, despite muscular market research and competitive analysis, couldn’t figure out why. Customers liked its core product, a standard lager, and store sales were up. But something wasn’t clicking in bars, and aggressive promotions weren’t helping. What was wrong?

A version of this article appeared in the March 2014 issue of Harvard Business Review.