From McCraw’s summary of Schumpeter’s History of Economic Analysis:
(p. 453) During the mid-nineteenth century, universities were beginning to teach economics, but “the demand for courses and textbooks produced courses and textbooks and not much else. Does this not show that there is something to one of the theses of this book, namely, that need is not the necessary and sufficient condition of analytic advance and that demand for teaching produces teaching and not necessarily scientific achievement?”
McCraw, Thomas K. Prophet of Innovation: Joseph Schumpeter and Creative Destruction. Cambridge, Mass.: Belknap Press, 2007.