The present paper is part of a not yet concluded research. It explores the hypothesis that the mathematical formalizations of The General Theory of Employment, Interest and Money (Keynes, 1936) developed by Roy Harrod, John Hicks, David Champernowne, Brian Reddaway and James Meade represent...

The General Theory of Employment, Interest and Money by John Maynard Keynes led up to three cross-shaped graphical interpretations: the IS-LM model, the 45º model and the Z-D model. The first one was originated from Hicks (1937) well-known paper, despite the differences between his original...

The hypothesis behind the ongoing research that motivates this paper suggests that the mathematical formalizations of the General Theory of Employment, Interest and Money advanced by Roy Harrod, John Hicks and James Meade, as well as the ones by David Champernowne and Brian Reddaway, although...