The best and most correct answer among the choices provided by the question is the second choice "as deliverers of both news and goods not produced in the region, they were seen as important to the economy of the region."
The Pax Mongolica (Latin for "Mongol Peace"), less often known as Pax Tatarica) ("Tatar Peace") is a historiographical term, modelled after the original phrasePax Romana, which describes the stabilising effects of the conquests of the Mongol Empire on the social, cultural, and economic life of the inhabitants of the empire.
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