Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Based on a sample of 140,000 U.K. companies over the period 1989-93, this paper finds a wide dispersion of labor productivity across firms. Some dispersion is transitory: amongst surviving companies there is regression towards the mean and dispersion falls over time. However, there are significant differences between sectors in the extent of dispersion, e.g., in manufacturing it is around 40 percent lower. A possible explanation is greater competition in manufacturing. A role for competition is also suggested by the finding that surviving companies which were initially below the mean improve their performance more rapidly than those initially above the mean. Copyright 1998 by Royal Economic Society.