In the global division of labor system, the empire exported capital to its occupied territories and the remaining Charlemagne, mainly in the form of direct investments by conglomerates. Having acquired capital and projects, monopolistic enterprises would purchase raw materials from resource countries, transport them to the empire for production. Once the products were manufactured, part of them would be consumed within the empire, with the remainder exported to other nations. The empire would pay both the occupied territories and Charlemagne with Marks as settlement for the goods. After receiving Marks, due to the immense scale of their trade surplus, how to manage and invest these in the international market posed a problem for Charlemagne. Being unable to purchase core high-quality assets from the empire with their accumulated foreign exchange reserves, Charlemagne could only buy the empire's low-interest government bonds.