Economists? The study of economy is only a few centuries old. Classical academies weren't like modern universities: they didn't produce professionals like doctors and agricultural scientists. Rather, they trained philosophers and rhetoricians. Hence the effects of an academy depend on the governor being susceptible to such ideas (although someone who is good at maths is always useful).
Similarly, the nomads must have some form of education, but that doesn't mean they had formal institutions for higher learning. Greek and Celtic smiths didn't learn their skills at an academy either.
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