Pablo: It was John Maurice. I have dealt with some (not all) of these issues in
Fiorito, Luca (2007) 'AN INSTITUTIONALIST'S JOURNEY INTO
THE YEARS OF HIGH THEORY: JOHN MAURICE CLARK ON THE
ACCELERATOR-MULTIPLIER INTERACTION', Journal of the History of Economic
Thought, 29:4, 437 - 452
As to Harrod, look at the contributions by Daniele Besomi I include
among the references.
Luca Fiorito