Feld wrote about the importance of "entrepreneurial density"--or the ratio of start-up founders and those they employ to the general population of a city--in his book, and emphasized the belief that access to easy capital is what makes or breaks a start-up community on his blog.
Richard Florida, a senior editor at The Atlantic, latched onto Feld's idea of mapping capital-rich start-up centers in a series of articles published this month. Here are 20 of the most capital-dense start-up communities in the country, according to his research.
FRANCESCA FENZI reports on entrepreneurship, technology and small business news from San Francisco. Her work has previously appeared in TIME, USA Today, Pop City and The Northside Chronicle. @FrancescaFenzi