Economic science […], if it be a science, differs from other sciences in this, that there is no inevitable advance from less to greater certainty; there is no ruthless tracking down of truth which, once unbared, shall be truth to all times to the complete confusion of any contrary doctrine.

H. Reynard and Alexander Gray, The Development of Economic Doctrine., The Economic Journal, vol. 41, no. 164, 1931, pp. 636, p. 12