New research from Ian Hathaway of the Center for American Entrepreneurship confirms a common theory in economic development circles: that high-growth firms are predominantly found in large and mid-sized cities with high densities of talented workers and a culture of entrepreneurship. Hathaway’s research uses data from Inc. Magazine’s Inc. 5000 lists for each year from 2011 to 2017, with a focus on the 14,000 unique companies from the lists that meet the OECD definition of high-growth – annualized revenue growth of 20 percent or more each year during a three-year period.