True, but shipping is not the limiting factor. Ships will turn up automatically when there are trade opportunities. The limitation are the docks, storages and distribution networks. Are there sources for Alexandria's rapid growth? The cited reference in the
Wikipedia article seems to be about culture rather than demographics.
That said: I just realized one of my arguments against the rapid growth of Alexandria is false. A city that big needs a massive import of grain. Because the Classical world did not have a food surplus, I reasoned this meant that the Ptolemids were paying for the grain, and that someone else was going short. However, Egypt did have a major grain surplus (they were one of the biggest exporters) so they could afford it.
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