Understanding the new forces of agglomeration and the forces of dispersion in the new Internet economy is one of the major themes of this book. Drawing on a wide range of data, it assembles the work of two teams of leading economists in the ICT field. Part 1 focuses on the role that the ICT revolution played in advanced countries to grow output and productivity at macro, industry, and firm levels. Part 2 assesses whether or not the digital economy will indeed result in a more competitive and more equal world.