Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
The endogenous growth literature includes two competing views concerning the influence of human capital on output growth: human capital may be a conventional input and determine just the level of output or it may be essential to raise productivity via R&D. Distinguishing empirically between these two alternatives is important. This paper shows that the suggestion by Aghion and Howitt (1998) for how to distinguish the two approaches will not work. Copyright 2000 by Oxford University Press.