Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This paper identifies a number of patterns in the sales of products within firms and over time in the PC software industry. For example, the authors find that a firm's initial product tends to be its most successful. There is also some indication that a firm's initial product sells better than its second, its second better than its third, and so on. The authors sketch some simple models consistent with these results. Copyright 1994 by MIT Press.