Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This note shows that there is an error in the mathematical argument deployed by J. L. Ford, W. S. Peng, and A. W. Mullineux (1992). Once this is corrected, the author sees that, remarkably, the standard opportunity cost based weighting system remains appropriate even in the face of nonneutral technical change. Copyright 1998 by Blackwell Publishing Ltd