What does "frozen in the currents of trade" mean?

I'm assuming that you are like looking for what the phrase is intending to mean, if that is the case then I would say the answer would bee unchanging or still, it's not going to change if it's "frozen." And I apologize if this is incorrect.

faithful servants eumaeus and philaetius:

his ragged vest then drawn aside disclosed the sign conspicuous, and the scar exposed: eager they view'd, with joy they stood amazed with tearful eyes o'er all their master gazed:

these servants know ulysses by the scar he got when he was a child - so when he showed them the mark, they immediately knew this is truly their master and they hugged him, finally starting to believe his words.