On January 10, 2014, the Growth Dialogue held a discussion event called Roundtable: Frontier Challenges of Urbanization in Washington, DC. A group of twenty economists, architects, and urban planners came together to think out of the box, debate recent urban developments and trends and identify policies that will help transform urbanization. The group focused on challenges facing the most rapidly urbanizing regions of the world. Policy insights gleaned from the discussion were highlighted in The Buzz in Cities: New Economic Thinking.