  Another version of social interactionism does not seek to show that national borders are morally important for determining what we owe each other by way of egalitarian justice. This approach holds that stricter egalitarian justice duties are gradually triggered by social interaction, and become more stringent and demanding as the density of social interaction increases (Cohen and Sabel 2006 and Julius 2006, see also Julius 2003). On this view, egalitarian justice duties might be strongest among the members of a political community, strong among people involved in dense regional trade and other forms of association, less strong among more far-flung inhabitants of the globe whose social interaction ties are slight.