Within the shipping lines, their agents who sell space on ships
use a tariff grid for each port of call that is differentiated according
to the type of container, 20ft, 40ft, refrigerated, etc. These grids
were used during the period when the conferences were in force,
since the rates were supposed to be charged according to agreements
among conference members. Despite the disappearance of
the conferences in October 2008, these grids have remained in
place, with each carrier establishing its own rate structure.