The years in-between the two World Wars were a crucial period for the building of economic dynamics as an autonomous field. Different competing research programs arose at international level. Great progress was achieved by studies on the business cycle, with the first statistical applications. Outside the theory of the business cycle, a significant line of inquiry was that pursued at the end of the 1930s by Hicks and Samuelson. This period also saw the formulation of another approach to formal economic dynamics which in the 1930s represented the frontier of research from the analytical...