This paper investigates the wage differentials of intermodal transportation carriers and ports under carrier economic regulation and deregulation. The estimation results suggest that the union wages of truck drivers, rail engineers and port dockworkers were comparable in the regulation period; in the deregulation period the union wages of truck drivers and rail engineers declined relative to those of dockworkers. The wage differential estimates indicate negative union hourly wage gaps for truck drivers and rail engineers of 22.7% and 6.9%, respectively, versus dockworkers. These results reflect the increase (decrease) in the relative bargaining power of dockworkers (truck drivers and rail engineers) in the deregulation period.
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