"This is perhaps the most telling point about cities. Even in this age of technology – where people can collaborate with people they barely know on the other side of the globe thanks to the internet – success depends, as Harvard economics professor Edward Glaeser points out in his book “The Triumph of the City”, on communities of individuals being in close physical proximity. Hence all the attention paid to encouraging clusters, whether they are in high-tech, as is the intention in the area around Hackney in east London, or anything else. Glaeser and others have plenty of evidence suggesting that future economic growth is dependent upon the ideas and initiatives originating in cities."