Well, for one thing, people usually did not need to speak a different language, but people who did (i.e traders) did not need to dabble about philosophy, it helps
A frequently used long−term solution you had if you were a trader was marrying a local or having an employee or a young member of the family do so. it would give you an interpreter in less than 12 years, which is not much in the grand scheme of things.
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