The study of economic growth has been an integral part of economics since its inception as a scholarly discipline. Research about the sources and implications of economic growth remain strong, and growth economics regularly takes advantage of advances in new tools and techniques. Volume Two of the Handbook of Economic Growth summarizes recent advances in theoretical and empirical work while offering new perspectives on a range of growth mechanisms, from the roles played by institutions and organizations to the ways factors beyond capital accumulation and technological change can affect growth.