Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Competition with product rivalry is examined in a model where products are differentiated by both quality and brand name. With no commitment, firms produce a full product line. When firms can commit to restrict their product offerings, firms specialize if the degree of brand-specific differentiation is small and they produce a full product line if brand-specific differentiation is large relative to intrafirm differentiation. Firms may crowd a product space when all competitors would be better-off with specialization. Brand proliferation is a credible entry-deterring strategy if the degree of brand-specific differentiation is not too large. Copyright 1993 by Blackwell Publishing Ltd.