This paper examines the determinants of employee job performance in th
e U.S. and Britain. We use two nationally representative data sets (th
e 1991 General Social Survey and the 1992 Employment in Britain survey
) that contain comparable indicators of job performance and of motivat
ion, ability and task characteristics. American employees were more li
kely to report higher levels of performance quantity and (especially)
quality. Most of our explanatory variables affected the two dimensions
of performance in similar ways in the two countries. Both quality and
quantity performance were more strongly affected by income in the U.S
. Quality of performance was more strongly related to the size of the
workplace in Britain. Quantity of performance was more strongly relate
d to the importance placed on promotion and to task significance among
American workers.