The main concept is that of an international solidarity expressed in practice through worldwide division of labor: free trade is the principal point in the program of internationalism.
This quote emphasizes the importance of global cooperation and economic interdependence as foundations for international unity. By embracing free trade and dividing labor across nations, countries can foster mutual benefits and promote peace. It suggests that economic integration is not only a practical approach but also a moral stance towards solidarity among nations, highlighting how shared economic interests can build a more harmonious global society.