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by JAlexoid 1343 days ago
It's pretty simple. PR isn't a major market, that means that delivering goods from US to PR isn't valuable enough to have economies of scale to kick in.

Add to that that most freight in The Lower 48 is ground(rail and road) - there's little demand for all American merchant fleet.

Low demand for services = low demand for new ships = older inefficient ships = high maintenance costs = lower profit or high prices = small markets get screwed (PR, Guam, Hawaii, etc)