Klein can well be said to have created the field of macroeconometric modeling almost singlehandedly. His international influence started at an early stage. The article offers scattered archive observations on Klein's early years from undergraduate study to the University of Pennsylvania in 1958....

Ragnar Frisch (1895–1973) played a major role in the foundation of econometrics as a discipline. Joint winner with Jan Tinbergen of the first Nobel prize in economics, he exerted a strong influence both on its development in the 1930s and, as editor of Econometrica for more than twenty...

Ragnar Frisch claimed on various occasions that he had invented the principles of input-output analysis. Frisch and Leontief worked simultaneously on their respective contributions but within different contexts. Frisch's contribution was an attempt to cope with market collapse of the depression...