forwarders because there was a lack of prior research on the forwarders
and, therefore, conceptual and operational definitions of the variables
came from prior research of manufacturing logistics or business logistics.
For this reason, many hypotheses were not supported in the results
including moderation effects of two orientations on the relationship
between commitment and response. In the future, researchers need to
develop fitted variables to reflect features of the forwarders. Second, MRA
is one of the superior methods for the analysis of a moderating effect on
the relationship between variables. However, researchers need to test the
effect to use the other methods like an analysis of structural equation
modeling because this kind of analysis is more informative than others.
Therefore, researchers need to perform port logistics research in various
aspects to reflect these limitations of this research.