In spite of the large and growing importance of the employer size-wage prem
ium, previous attempts to account for this premium using observable worker
or employer characteristics have had limited success. The problem is that,
while most theoretical explanations for the size-wage premium are based on
the matching of employers and employees, previous empirical work has relied
on either worker surveys with little information about the employer, or es
tablishment surveys with little information about the workers. In contrast,
this study uses the newly created Worker-Establishment Characteristic Data
base, which contains linked employer-employee data for a large sample of U.
S. manufacturing workers and establishments, to examine seven explanations
for the employer size-wage premium. A number of the explanations can accoun
t for some of the observed cross-sectional variation in worker wages. Howev
er, none of the explanations can fully account for the employer size-wage p
remium. In the end there remains a large, significant, and unexplained prem
ium paid to workers of large employers.