What did the Pax Mongolica primarily enhance in terms of trade?

The Pax Mongolica, which translates to "Mongol Peace," was a period of stability and relative peace throughout the vast territories controlled by the Mongol Empire during the 13th and 14th centuries. This stability significantly enhanced the security of trade routes across Asia, particularly the Silk Roads that connected Europe and Asia.

Under Mongol rule, merchants were given protection while traveling, and the empire established a postal relay system that improved communication and facilitated trade. This environment allowed for safer and more dependable transport of goods, ideas, and culture across long distances. Merchants could travel and engage in commerce with less fear of banditry or the disruptions caused by local warfare, which were common prior to the Mongol consolidation of power.

The other options focus on aspects like profit margins, training of new merchants, and maritime trade, which, while relevant in their own contexts, do not directly address the main contribution of the Pax Mongolica. The primary enhancement was the overarching security that enabled trade to flourish, making it possible for various cultures to engage economically and exchange goods, technologies, and ideas.