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Employers "hopeful that this will allow us to move toward conclusion of an agreement in the near term."
Move comes as ILWU, PMA talks enter 10th month.
Acquisition would make Japan Post one of the largest global 3PLs.
Marine terminal officials agree that future contracts will require ongoing collaboration.
Maersk Line CEO Soren Skou told American Shipper container lines need to adapt to permanent overcapacity, and cited Maersk's network management as the primary driver of bumper profits in recent years.
Economist revised forecasts, predicting lower import growth and a second year of declines in exports.