Union trucking firms have significantly different cost structures than
non-union firms. Further, average costs for union firms are higher th
an for non-union firms even after controlling for higher unionized lab
or costs. The translog cost function approach used here incorporates a
unique dummy variable technique to test not only for overall differen
ces in union/non-union costs, but also to identify which individual co
st function parameters differ between the two types of firms. Results
suggest that unionized trucking firms are at a competitive disadvantag
e in the less regulated, post-1980 trucking industry.